Hello i've just download the new version of PZ gog client and i see some problem. By exemple when i clic on mod on the mainscreen i have an error
1512501922837 function: onMenuItemMouseDownMainMenu -- file: MainScreen.lua line # 1353

i also saw that the mainscreen.lua is different of the steam version 77Ko on gog 75Ko on steam.
Now with this new build i can't crossplay steam/gog because i have diffrerent lua.

Nope, mods should not interfere with Menu lua stuff.

Its obvious that GOG menu is different, because GOG has steam workshop integration removed.

I suggest you to tripplecheck your mod, specifically if you have followed instructions correctly and that mod is actually 38. compatible.