diff --git a/kcms/desktoptheme/kcm.cpp b/kcms/desktoptheme/kcm.cpp
index ef7c80dc6..ec6a92ac6 100644
--- a/kcms/desktoptheme/kcm.cpp
+++ b/kcms/desktoptheme/kcm.cpp
@@ -1,322 +1,323 @@
 /* This file is part of the KDE Project
    Copyright (c) 2014 Marco Martin <mart@kde.org>
    Copyright (c) 2014 Vishesh Handa <me@vhanda.in>
    Copyright (c) 2016 David Rosca <nowrep@gmail.com>
    Copyright (c) 2018 Kai Uwe Broulik <kde@privat.broulik.de>
 
    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License version 2 as published by the Free Software Foundation.
 
    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Library General Public License for more details.
 
    You should have received a copy of the GNU Library General Public License
    along with this library; see the file COPYING.LIB.  If not, write to
    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
    Boston, MA 02110-1301, USA.
 */
 
 #include "kcm.h"
 
 #include <KPluginFactory>
 #include <KAboutData>
 #include <KSharedConfig>
 #include <KLocalizedString>
 #include <KDesktopFile>
 
 #include <Plasma/Theme>
 #include <Plasma/Svg>
 
 #include <QDebug>
 #include <QProcess>
 #include <QQuickItem>
 #include <QQuickWindow>
 #include <QStandardPaths>
 #include <QStandardItemModel>
 
 #include <KNewStuff3/KNS3/DownloadDialog>
 
 Q_LOGGING_CATEGORY(KCM_DESKTOP_THEME, "kcm_desktoptheme")
 
 K_PLUGIN_FACTORY_WITH_JSON(KCMDesktopThemeFactory, "kcm_desktoptheme.json", registerPlugin<KCMDesktopTheme>();)
 
 KCMDesktopTheme::KCMDesktopTheme(QObject *parent, const QVariantList &args)
     : KQuickAddons::ConfigModule(parent, args)
     , m_defaultTheme(new Plasma::Theme(this))
     , m_haveThemeExplorerInstalled(false)
 {
     //This flag seems to be needed in order for QQuickWidget to work
     //see https://bugreports.qt-project.org/browse/QTBUG-40765
     //also, it seems to work only if set in the kcm, not in the systemsettings' main
     qApp->setAttribute(Qt::AA_DontCreateNativeWidgetSiblings);
     qmlRegisterType<QStandardItemModel>();
 
     KAboutData* about = new KAboutData(QStringLiteral("kcm_desktoptheme"), i18n("Configure Desktop Theme"),
                                        QStringLiteral("0.1"), QString(), KAboutLicense::LGPL);
     about->addAuthor(i18n("David Rosca"), QString(), QStringLiteral("nowrep@gmail.com"));
     setAboutData(about);
     setButtons(Apply | Default | Help);
 
     m_model = new QStandardItemModel(this);
     QHash<int, QByteArray> roles = m_model->roleNames();
     roles[PluginNameRole] = QByteArrayLiteral("pluginName");
     roles[ThemeNameRole] = QByteArrayLiteral("themeName");
     roles[DescriptionRole] = QByteArrayLiteral("description");
     roles[IsLocalRole] = QByteArrayLiteral("isLocal");
     roles[PendingDeletionRole] = QByteArrayLiteral("pendingDeletion");
     m_model->setItemRoleNames(roles);
 
     m_haveThemeExplorerInstalled = !QStandardPaths::findExecutable(QStringLiteral("plasmathemeexplorer")).isEmpty();
 }
 
 KCMDesktopTheme::~KCMDesktopTheme()
 {
     delete m_defaultTheme;
 }
 
 QStandardItemModel *KCMDesktopTheme::desktopThemeModel() const
 {
     return m_model;
 }
 
 QString KCMDesktopTheme::selectedPlugin() const
 {
     return m_selectedPlugin;
 }
 
 void KCMDesktopTheme::setSelectedPlugin(const QString &plugin)
 {
     if (m_selectedPlugin == plugin) {
         return;
     }
     m_selectedPlugin = plugin;
     emit selectedPluginChanged(m_selectedPlugin);
     emit selectedPluginIndexChanged();
     updateNeedsSave();
 }
 
 int KCMDesktopTheme::selectedPluginIndex() const
 {
     const auto results = m_model->match(m_model->index(0, 0), PluginNameRole, m_selectedPlugin);
     if (results.count() == 1) {
         return results.first().row();
     }
 
     return -1;
 }
 
 void KCMDesktopTheme::setPendingDeletion(int index, bool pending)
 {
     QModelIndex idx = m_model->index(index, 0);
 
     m_model->setData(idx, pending, PendingDeletionRole);
 
     if (pending && selectedPluginIndex() == index) {
         // move to the next non-pending theme
         const auto nonPending = m_model->match(idx, PendingDeletionRole, false);
         setSelectedPlugin(nonPending.first().data(PluginNameRole).toString());
     }
 
     updateNeedsSave();
 }
 
 void KCMDesktopTheme::getNewStuff(QQuickItem *ctx)
 {
     if (!m_newStuffDialog) {
         m_newStuffDialog = new KNS3::DownloadDialog(QStringLiteral("plasma-themes.knsrc"));
         m_newStuffDialog.data()->setWindowTitle(i18n("Download New Desktop Themes"));
         m_newStuffDialog->setWindowModality(Qt::WindowModal);
         m_newStuffDialog->winId(); // so it creates the windowHandle();
         connect(m_newStuffDialog.data(), &KNS3::DownloadDialog::accepted, this, &KCMDesktopTheme::load);
     }
 
     if (ctx && ctx->window()) {
         m_newStuffDialog->windowHandle()->setTransientParent(ctx->window());
     }
 
     m_newStuffDialog.data()->show();
 }
 
 void KCMDesktopTheme::installThemeFromFile(const QUrl &file)
 {
     qCDebug(KCM_DESKTOP_THEME) << "Installing ... " << file;
 
     const QString program = QStringLiteral("kpackagetool5");
     const QStringList arguments = { QStringLiteral("--type"), QStringLiteral("Plasma/Theme"), QStringLiteral("--install"), file.toLocalFile()};
 
     qCDebug(KCM_DESKTOP_THEME) << program << arguments.join(QStringLiteral(" "));
     QProcess *myProcess = new QProcess(this);
     connect(myProcess, static_cast<void (QProcess::*)(int, QProcess::ExitStatus)>(&QProcess::finished),
             this, [this, myProcess](int exitCode, QProcess::ExitStatus exitStatus) {
                 Q_UNUSED(exitStatus);
                 if (exitCode == 0) {
+                    emit showSuccessMessage(i18n("Theme installed successfully."));
                     load();
                 } else {
                     Q_EMIT showErrorMessage(i18n("Theme installation failed."));
 
                 }
             });
 
     connect(myProcess, static_cast<void (QProcess::*)(QProcess::ProcessError)>(&QProcess::error),
             this, [this](QProcess::ProcessError e) {
                 qCWarning(KCM_DESKTOP_THEME) << "Theme installation failed: " << e;
                 Q_EMIT showErrorMessage(i18n("Theme installation failed."));
             });
 
     myProcess->start(program, arguments);
 }
 
 void KCMDesktopTheme::applyPlasmaTheme(QQuickItem *item, const QString &themeName)
 {
     if (!item) {
         return;
     }
 
     Plasma::Theme *theme = m_themes[themeName];
     if (!theme) {
         theme = new Plasma::Theme(themeName, this);
         m_themes[themeName] = theme;
     }
 
     Q_FOREACH (Plasma::Svg *svg, item->findChildren<Plasma::Svg*>()) {
         svg->setTheme(theme);
         svg->setUsingRenderingCache(false);
     }
 }
 
 void KCMDesktopTheme::load()
 {
     m_pendingRemoval.clear();
 
     // Get all desktop themes
     QStringList themes;
     const QStringList &packs = QStandardPaths::locateAll(QStandardPaths::GenericDataLocation, QStringLiteral("plasma/desktoptheme"), QStandardPaths::LocateDirectory);
     Q_FOREACH (const QString &ppath, packs) {
         const QDir cd(ppath);
         const QStringList &entries = cd.entryList(QDir::Dirs | QDir::Hidden | QDir::NoDotAndDotDot);
         Q_FOREACH (const QString &pack, entries) {
             const QString _metadata = ppath + QLatin1Char('/') + pack + QStringLiteral("/metadata.desktop");
             if (QFile::exists(_metadata)) {
                 themes << _metadata;
             }
         }
     }
 
     m_model->clear();
 
     Q_FOREACH (const QString &theme, themes) {
         int themeSepIndex = theme.lastIndexOf(QLatin1Char('/'), -1);
         const QString themeRoot = theme.left(themeSepIndex);
         int themeNameSepIndex = themeRoot.lastIndexOf(QLatin1Char('/'), -1);
         const QString packageName = themeRoot.right(themeRoot.length() - themeNameSepIndex - 1);
 
         KDesktopFile df(theme);
 
         if (df.noDisplay()) {
             continue;
         }
 
         QString name = df.readName();
         if (name.isEmpty()) {
             name = packageName;
         }
         const bool isLocal = QFileInfo(theme).isWritable();
 
         if (m_model->findItems(packageName).isEmpty()) {
             QStandardItem *item = new QStandardItem;
             item->setText(packageName);
             item->setData(packageName, PluginNameRole);
             item->setData(name, ThemeNameRole);
             item->setData(df.readComment(), DescriptionRole);
             item->setData(isLocal, IsLocalRole);
             item->setData(false, PendingDeletionRole);
             m_model->appendRow(item);
         }
     }
 
     KConfigGroup cg(KSharedConfig::openConfig(QStringLiteral("plasmarc")), "Theme");
     setSelectedPlugin(cg.readEntry("name", m_defaultTheme->themeName()));
 
     updateNeedsSave();
 }
 
 void KCMDesktopTheme::save()
 {
     if (m_defaultTheme->themeName() != m_selectedPlugin) {
         m_defaultTheme->setThemeName(m_selectedPlugin);
     }
 
     processPendingDeletions();
     updateNeedsSave();
 }
 
 void KCMDesktopTheme::defaults()
 {
     setSelectedPlugin(QStringLiteral("default"));
 
     // can this be done more elegantly?
     const auto pendingDeletions = m_model->match(m_model->index(0, 0), PendingDeletionRole, true);
     for (const QModelIndex &idx : pendingDeletions) {
         m_model->setData(idx, false, PendingDeletionRole);
     }
 }
 
 bool KCMDesktopTheme::canEditThemes() const
 {
     return m_haveThemeExplorerInstalled;
 }
 
 void KCMDesktopTheme::editTheme(const QString &theme)
 {
     QProcess::startDetached(QStringLiteral("plasmathemeexplorer -t ") % theme);
 }
 
 void KCMDesktopTheme::updateNeedsSave()
 {
     setNeedsSave(!m_model->match(m_model->index(0, 0), PendingDeletionRole, true).isEmpty()
                     || m_selectedPlugin != m_defaultTheme->themeName());
 }
 
 void KCMDesktopTheme::processPendingDeletions()
 {
     const QString program = QStringLiteral("plasmapkg2");
 
     const auto pendingDeletions = m_model->match(m_model->index(0, 0), PendingDeletionRole, true, -1 /*all*/);
     QVector<QPersistentModelIndex> persistentPendingDeletions;
     // turn into persistent model index so we can delete as we go
     std::transform(pendingDeletions.begin(), pendingDeletions.end(),
                    std::back_inserter(persistentPendingDeletions), [](const QModelIndex &idx) {
         return QPersistentModelIndex(idx);
     });
 
     for (const QPersistentModelIndex &idx : persistentPendingDeletions) {
         const QString pluginName = idx.data(PluginNameRole).toString();
         const QString displayName = idx.data(Qt::DisplayRole).toString();
 
         Q_ASSERT(pluginName != m_selectedPlugin);
 
         const QStringList arguments = {QStringLiteral("-t"), QStringLiteral("theme"), QStringLiteral("-r"), pluginName};
 
         QProcess *process = new QProcess(this);
         connect(process, static_cast<void (QProcess::*)(int, QProcess::ExitStatus)>(&QProcess::finished), this,
             [this, process, idx, pluginName, displayName](int exitCode, QProcess::ExitStatus exitStatus) {
                 Q_UNUSED(exitStatus);
                 if (exitCode == 0) {
                     m_model->removeRow(idx.row());
                 } else {
                     emit showErrorMessage(i18n("Removing theme failed: %1",
                                                QString::fromLocal8Bit(process->readAllStandardOutput().trimmed())));
                     m_model->setData(idx, false, PendingDeletionRole);
                 }
                 process->deleteLater();
             });
 
         process->start(program, arguments);
         process->waitForFinished(); // needed so it deletes fine when "OK" is clicked and the dialog destroyed
     }
 }
 
 #include "kcm.moc"