Don't set updatePending = false if manifest URL is not available.

src/main/java/com/skcraft/launcher/update/Updater.java

@@ -82,9 +82,6 @@ public class Updater extends BaseUpdater implements Callable<Instance>, Progress
                 String message = _("updater.updateRequiredButNoManifest");
                 throw new LauncherException("Update required but no manifest", message);
             } else {
-                instance.setUpdatePending(false);
-                Persistence.commitAndForget(instance);
-
                 log.info("Can't update " + instance.getTitle() + ", but update is not required");
                 return instance; // Can't update
             }