Thanks for testing. And next funny thing - I forgot to uninstall APOS plugin, so it still created welcome post for you in forum, but forum is not installed... Just a reminder to look at it.
I finally separated core sync functionality into the simple plugin. The main goal was to minimalize core changes for easier updates.
There is no point to continue with theme development for e107 for me
Metis theme is now running on bootstrap5
The ways how to customize admin area (That ones I found)
Using WP for areas when e107 fails and e107 for adminstration custom things
Navigation menu was added some time ago to core
GLORIOUS YEARS
SATISFACTION RATE
e107 THEMES
e107 PLUGINS