diff --git a/kcms/desktoptheme/CMakeLists.txt b/kcms/desktoptheme/CMakeLists.txt
--- a/kcms/desktoptheme/CMakeLists.txt
+++ b/kcms/desktoptheme/CMakeLists.txt
@@ -10,6 +10,8 @@
 target_link_libraries(kcm_desktoptheme
   KF5::CoreAddons
   KF5::KCMUtils
+  KF5::KIOCore
+  KF5::KIOWidgets
   KF5::I18n
   KF5::Plasma
   KF5::Declarative
diff --git a/kcms/desktoptheme/kcm.h b/kcms/desktoptheme/kcm.h
--- a/kcms/desktoptheme/kcm.h
+++ b/kcms/desktoptheme/kcm.h
@@ -26,11 +26,18 @@
 
 #include <KNewStuff3/KNS3/DownloadDialog>
 
+class QTemporaryFile;
+
 namespace Plasma {
     class Svg;
     class Theme;
 }
 
+namespace KIO
+{
+class FileCopyJob;
+}
+
 class QQuickItem;
 class QStandardItemModel;
 
@@ -40,6 +47,7 @@
     Q_PROPERTY(QStandardItemModel *desktopThemeModel READ desktopThemeModel CONSTANT)
     Q_PROPERTY(QString selectedPlugin READ selectedPlugin WRITE setSelectedPlugin NOTIFY selectedPluginChanged)
     Q_PROPERTY(int selectedPluginIndex READ selectedPluginIndex NOTIFY selectedPluginIndexChanged)
+    Q_PROPERTY(bool downloadingFile READ downloadingFile NOTIFY downloadingFileChanged)
     Q_PROPERTY(bool canEditThemes READ canEditThemes CONSTANT)
 
 public:
@@ -61,10 +69,12 @@
     void setSelectedPlugin(const QString &plugin);
     int selectedPluginIndex() const;
 
+    bool downloadingFile() const;
+
     bool canEditThemes() const;
 
     Q_INVOKABLE void getNewStuff(QQuickItem *ctx);
-    Q_INVOKABLE void installThemeFromFile(const QUrl &file);
+    Q_INVOKABLE void installThemeFromFile(const QUrl &url);
 
     Q_INVOKABLE void setPendingDeletion(int index, bool pending);
 
@@ -75,6 +85,8 @@
 Q_SIGNALS:
     void selectedPluginChanged(const QString &plugin);
     void selectedPluginIndexChanged();
+    void downloadingFileChanged();
+
     void showSuccessMessage(const QString &message);
     void showErrorMessage(const QString &message);
 
@@ -88,14 +100,19 @@
 
     void processPendingDeletions();
 
+    void installTheme(const QString &path);
+
     QStandardItemModel *m_model;
     QString m_selectedPlugin;
     QStringList m_pendingRemoval;
     Plasma::Theme *m_defaultTheme;
     QHash<QString, Plasma::Theme*> m_themes;
     bool m_haveThemeExplorerInstalled;
 
     QPointer<KNS3::DownloadDialog> m_newStuffDialog;
+
+    QScopedPointer<QTemporaryFile> m_tempInstallFile;
+    QPointer<KIO::FileCopyJob> m_tempCopyJob;
 };
 
 Q_DECLARE_LOGGING_CATEGORY(KCM_DESKTOP_THEME)
diff --git a/kcms/desktoptheme/kcm.cpp b/kcms/desktoptheme/kcm.cpp
--- a/kcms/desktoptheme/kcm.cpp
+++ b/kcms/desktoptheme/kcm.cpp
@@ -27,6 +27,9 @@
 #include <KLocalizedString>
 #include <KDesktopFile>
 
+#include <KIO/FileCopyJob>
+#include <KIO/JobUiDelegate>
+
 #include <Plasma/Theme>
 #include <Plasma/Svg>
 
@@ -36,6 +39,7 @@
 #include <QQuickWindow>
 #include <QStandardPaths>
 #include <QStandardItemModel>
+#include <QTemporaryFile>
 
 #include <KNewStuff3/KNS3/DownloadDialog>
 
@@ -108,6 +112,11 @@
     return -1;
 }
 
+bool KCMDesktopTheme::downloadingFile() const
+{
+    return m_tempCopyJob;
+}
+
 void KCMDesktopTheme::setPendingDeletion(int index, bool pending)
 {
     QModelIndex idx = m_model->index(index, 0);
@@ -140,12 +149,47 @@
     m_newStuffDialog.data()->show();
 }
 
-void KCMDesktopTheme::installThemeFromFile(const QUrl &file)
+void KCMDesktopTheme::installThemeFromFile(const QUrl &url)
+{
+    if (url.isLocalFile()) {
+        installTheme(url.toLocalFile());
+        return;
+    }
+
+    if (m_tempCopyJob) {
+        return;
+    }
+
+    m_tempInstallFile.reset(new QTemporaryFile());
+    if (!m_tempInstallFile->open()) {
+        emit showErrorMessage(i18n("Unable to create a temporary file."));
+        m_tempInstallFile.reset();
+        return;
+    }
+
+    m_tempCopyJob = KIO::file_copy(url, QUrl::fromLocalFile(m_tempInstallFile->fileName()),
+                                    -1, KIO::Overwrite);
+    m_tempCopyJob->uiDelegate()->setAutoErrorHandlingEnabled(true);
+    emit downloadingFileChanged();
+
+    connect(m_tempCopyJob, &KIO::FileCopyJob::result, this, [this, url](KJob *job) {
+        if (job->error() != KJob::NoError) {
+            emit showErrorMessage(i18n("Unable to download the color scheme: %1", job->errorText()));
+            return;
+        }
+
+        installTheme(m_tempInstallFile->fileName());
+        m_tempInstallFile.reset();
+    });
+    connect(m_tempCopyJob, &QObject::destroyed, this, &KCMDesktopTheme::downloadingFileChanged);
+}
+
+void KCMDesktopTheme::installTheme(const QString &path)
 {
-    qCDebug(KCM_DESKTOP_THEME) << "Installing ... " << file;
+    qCDebug(KCM_DESKTOP_THEME) << "Installing ... " << path;
 
     const QString program = QStringLiteral("kpackagetool5");
-    const QStringList arguments = { QStringLiteral("--type"), QStringLiteral("Plasma/Theme"), QStringLiteral("--install"), file.toLocalFile()};
+    const QStringList arguments = { QStringLiteral("--type"), QStringLiteral("Plasma/Theme"), QStringLiteral("--install"), path};
 
     qCDebug(KCM_DESKTOP_THEME) << program << arguments.join(QStringLiteral(" "));
     QProcess *myProcess = new QProcess(this);
diff --git a/kcms/desktoptheme/package/contents/ui/main.qml b/kcms/desktoptheme/package/contents/ui/main.qml
--- a/kcms/desktoptheme/package/contents/ui/main.qml
+++ b/kcms/desktoptheme/package/contents/ui/main.qml
@@ -32,6 +32,8 @@
     view.model: kcm.desktopThemeModel
     view.currentIndex: kcm.selectedPluginIndex
 
+    enabled: !kcm.downloadingFile
+
     DropArea {
         anchors.fill: parent
         onEntered: {