Hi there!
Sorry for the inconvenience!
You can try the following:
Please take a full site backup first in order to prevent any data loss.
Please uninstall your SP Easy Image Gallery component by 1st unpublishing your module/extension (from the Extensions\Modules tab) and trashing it.
Then go to Extensions tab again and navigate to "Manage" and find your SP Easy Image Gallery extension, then unpublish it and then 'Uninstall' from menu option.
Download a fresh copy / package of the SP Easy Image Gallery Extension from JoomShaper's Extensions Download page and reinstall, then recreate its content.
PS: you are basically then disassociating the original database associated with the template and allowing the Extension upon new installation to recreate a new / blank database that will work with current version of template
Hope this helps!
Note: Please take a full site backup before trying anything!
Best Regards