JoomGallery 3.7.0-rc1 is only a preparation for the migration to JoomGallery 4.0.
So that you can carry out the migration smoothly, we have integrated an additional check and another batch job into the Maintenance Manager.
The batch job corrects - where necessary - the alias and the folder structure of the JoomGallery categories.
This adjustment allows you to use the new directory structure in the new JoomGallery 4.x, which brings performance advantages in particular.
Without this customization you have to use the so-called "compatibility mode" in JoomGallery 4.x.
We have explained how the migration itself works on the following help page: Migration: Jg3ToJg4
If you have any questions, please use our support forum.
Note: Only use this version on a copy of your website to test the migration, not in a productive installation.