Upgrade process is not finishing
1) If you're updating to Ultimate Member 2.0.4 from a previous version of the plugin, you will need to run the upgrade process which upgrades the databases.
2) If you have an issue with the upgrade process not completing or sticking, please go to your installed plugins page and deactivate any pre2.0 Ultimate Member extensions and run the upgrade process again.
3) After this, if you need to upgrade the extension. Please activate and upgrade the extensions to the latest, compatible with 2.0.4 core, in sequence.
4) Also, you can install and activate this plugin Upgrade Patch if you still have the issues with AJAX upgrade process.
5) In case of failure of automatic updating, you can always update plugins manually via FTP. You can download the latest extension's versions here