Thank you for this! I will begin testing this weekend.
What are the proper steps to upgrade from J3 & JG3 to J4 and JG4? I'm working on a rough outline for documentation purposes, here's what I have so far:
1) Create a new site on my server called "testsite.domain.com"
2) Use Akeeba Backup to back up my live site, and restore it to testsite.domain.com
3) Go to https://github.com/JoomGalleryfriends/JG4-dev and download a current copy of JG4 repository in ZIP format.
4) Upgrade test site from J3 to J4
(Next Steps uncertain:)
Uninstall JG3?
Install JG4 over JG3?
Do I need to change PHP versions from 7 to 8 at any point, or after all upgrades are done?