Fix error handling

administrator/components/com_installer/src/Model/InstallModel.php

@@ -331,7 +331,9 @@ protected function _getPackageFromUpload()
         try {
             File::upload($tmp_src, $tmp_dest, false, true);
         } catch (FilesystemException $exception) {
+            Factory::getApplication()->enqueueMessage(Text::_('COM_INSTALLER_MSG_INSTALL_WARNINSTALLUPLOADERROR'), 'error');
 
+            return false;
         }
 
         // Unpack the downloaded package file.

administrator/components/com_joomlaupdate/src/Model/UpdateModel.php

@@ -511,7 +511,7 @@ protected function downloadPackage($url, $target)
             try {
                 File::delete($target);
             } catch (FilesystemException $exception) {
-
+                return false;
             }
         }
 
@@ -618,7 +618,7 @@ public function createUpdateFile($basename = null): bool
             try {
                 File::delete($configpath);
             } catch (FilesystemException $exception) {
-
+                return false;
             }
         }