Since we released the updated version Youzer called Youzify in update 3.15, we decided to point out a few important things to upgrade it safely. Please follow the below steps:
1. Before updating, take a backup of the site via Tools > Backup:
2. Under Plugins > Installed Plugins disable Youzer and each Youzer Addons if there are any:

3. Make sure all old Youzer patches are done:
4. Go to the bottom of the page settings Youzify panel > General Settings > Upgrade Youzer to Youzify and run the patches one by one:
5. Delete the old Youzer version under Plugins > Installed Plugins and leave only the Youzify version:

Example: The old activity shortcode [youzer_activity] is now [youzify_activity].