diff --git a/src/core/engine.cpp b/src/core/engine.cpp
--- a/src/core/engine.cpp
+++ b/src/core/engine.cpp
@@ -679,12 +679,10 @@
     emit signalEntryChanged(entry);
 
     qCDebug(KNEWSTUFFCORE) << "about to uninstall entry " << entry.uniqueId();
-    // FIXME: change the status?
     m_installation->uninstall(actualEntryForUninstall);
 
-    entry.setStatus(KNS3::Entry::Deleted); //status for actual entry gets set in m_installation->uninstall()
+    entry.setStatus(actualEntryForUninstall.status());
     emit signalEntryChanged(entry);
-
 }
 
 void Engine::loadDetails(const KNSCore::EntryInternal &entry)
diff --git a/src/core/installation.h b/src/core/installation.h
--- a/src/core/installation.h
+++ b/src/core/installation.h
@@ -105,16 +105,15 @@
      *
      * The entry instance will be updated with any new information:
      * <ul>
-     * <li>Status will be set to Deleted
+     * <li>Status will be set to Deleted, unless the uninstall script exists with an error
      * <li>uninstalledFiles will list files which were removed during uninstallation
      * <li>installedFiles will become empty
      * </ul>
      *
      * @param entry The entry to deinstall
      *
-     * @note FIXME: I don't believe this works yet :)
      */
-    void uninstall(KNSCore::EntryInternal entry);
+    void uninstall(KNSCore::EntryInternal &entry);
 
     // TODO KF6: remove, was used with deprecated Security class.
 #if KNEWSTUFFCORE_ENABLE_DEPRECATED_SINCE(5, 31)
diff --git a/src/core/installation.cpp b/src/core/installation.cpp
--- a/src/core/installation.cpp
+++ b/src/core/installation.cpp
@@ -523,7 +523,7 @@
                     installfile = source.fileName();
                 }
             }
-            QString installpath = installdir + QLatin1Char('/') + installfile;
+            QString installpath = QDir(installdir).filePath(installfile);
 
             qCDebug(KNEWSTUFFCORE) << "Install to file " << installpath;
             // FIXME: copy goes here (including overwrite checking)
@@ -593,32 +593,64 @@
     return ret;
 }
 
-void Installation::uninstall(EntryInternal entry)
+void Installation::uninstall(EntryInternal &entry)
 {
-    entry.setStatus(KNS3::Entry::Deleted);
+    // If all the files are removed assume that the entry got manually removed
+    // otherwise there would be no way to delete the entry that editing the register
+    bool manuallyUninstalled = true;
+    const auto lst = entry.installedFiles();
+    for (const auto &file : lst) {
+        if (QFile::exists(file)) {
+            manuallyUninstalled = false;
+            break;
+        }
+    }
+    if (manuallyUninstalled) {
+        entry.setStatus(KNS3::Entry::Deleted);
+        emit signalEntryChanged(entry);
+        return;
+    }
 
+    // If there is an uninstall script, make sure it runs without errors
     if (!uninstallCommand.isEmpty()) {
-        const auto lst = entry.installedFiles();
         for (const QString &file : lst) {
             QFileInfo info(file);
             if (info.isFile()) {
                 QString fileArg(KShell::quoteArg(file));
                 QString command(uninstallCommand);
                 command.replace(QLatin1String("%f"), fileArg);
 
-                int exitcode = QProcess::execute(command, QStringList());
+                QStringList args = KShell::splitArgs(command);
+                const QString program = args.takeFirst();
+                QProcess process;
+                process.start(program, args);
+                process.waitForFinished(-1);
+
+                if (process.exitCode()) {
+                    const QString processOutput = QString::fromLocal8Bit(process.readAllStandardError());
+                    const QString err = i18n("The uninstallation process failed to successfully run the command %1\n"
+                                             "The output of was: \n%2\n"
+                                             "If you think this is incorrect, you can continue or cancel the uninstallation process",
+                                             KShell::quoteArg(command), processOutput);
+                    emit signalInstallationError(err);
+                    // Ask the user if he wants to continue, even though the script failed
+                    Question question(Question::ContinueCancelQuestion);
+                    question.setQuestion(err);
+                    Question::Response response = question.ask();
+                    if (response == Question::CancelResponse) {
+                        // Use can delete files manually
+                        entry.setStatus(KNS3::Entry::Installed);
+                        emit signalEntryChanged(entry);
+                        return;
+                    }
 
-                if (exitcode) {
-                    emit signalInstallationError(i18n("The uninstallation process failed to successfully run the command %1", command));
-                    qCCritical(KNEWSTUFFCORE) << "Command failed" << command;
                 } else {
                     qCDebug(KNEWSTUFFCORE) << "Command executed successfully: " << command;
                 }
             }
         }
     }
 
-    const auto lst = entry.installedFiles();
     for (const QString &file : lst) {
         if (file.endsWith(QLatin1Char('/'))) {
             QDir dir;
@@ -649,7 +681,7 @@
     }
     entry.setUnInstalledFiles(entry.installedFiles());
     entry.setInstalledFiles(QStringList());
-
+    entry.setStatus(KNS3::Entry::Deleted);
     emit signalEntryChanged(entry);
 }