Why does my Resume Upgrade Always Fail?
"Popup Maker needs to complete a database upgrade that was previously started, click here to resume the upgrade."
"Upgrade failed, please try again.".
The Underlying Issue
- Add this line of code: delete_option( 'pum_doing_upgrade' );
either to the code editor of the 'My Custom Functions' plugin, or within the functions.php file of your site theme (child or parent theme).
2. Refresh your browser a few times until it disappears.
3. Edit your functions.php file and remove that line.