I tried everything, however long story short: I end up with a fresh installation just trying to isolate the causes and I found that the addon conflicts, and is immediately marked with (!), when I open the template to edit the marks settings (Edit Marks Template window).
This is what the debug log ui shows:
Whole ror folder is not read-only, and I repeated the check periodically.
Installation is fresh, version of Enemy is 2.8.4 from Idrinth site.
libraries are fresh, did not switched any setting from old backup: just restored manually everything.
I read multiple posts but can't figure out what the heck is happening: does anyone have the same problem?