diff --git a/src/plugin_system/store_install.py b/src/plugin_system/store_install.py
index 6e9da62a..8e8a90b4 100644
--- a/src/plugin_system/store_install.py
+++ b/src/plugin_system/store_install.py
@@ -95,7 +95,7 @@ class _InstallMixin:
             if installed:
                 self._discard_backup(
                     plugin_id, backup_path, "install",
-                    new_path=self._find_plugin_path(plugin_id) or plugin_path)
+                    new_path=self._existing_install(plugin_id) or plugin_path)
                 return True
 
             self._restore_backup(plugin_id, plugin_path, backup_path, "Install")
diff --git a/src/plugin_system/store_update.py b/src/plugin_system/store_update.py
index 92f8816f..4c1ec480 100644
--- a/src/plugin_system/store_update.py
+++ b/src/plugin_system/store_update.py
@@ -309,7 +309,7 @@ class _UpdateMixin:
                 # rather than the old directory name.
                 self._discard_backup(
                     plugin_id, backup_path, "update",
-                    new_path=self._find_plugin_path(plugin_id) or plugin_path)
+                    new_path=self._existing_install(plugin_id) or plugin_path)
                 return True
 
             # Bad network, registry error...: the user keeps a working plugin.