can you please take a screenshot of BG3 for me please?
Im trying to create a installation path to install the latest patch with offline installer.. My internet is really slow to download the whole game and the patch is just 50mb

here is the location> HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\GOG.com\Games\1456460669

You don't need to download the whole game with the offline installer. That's a problem with Galaxy. 50 MB is practically nothing, so even with your slow internet it won't take that long. Alternatively, you can have someone with a faster connection put it on a USB stick and give it to you.

do you know where to find the changelog of the latest patch? (4.1.106.9344 Submission) what is Submission patch? the game is not in EA anymore?
Im trying to check it but cant find any changelog

you don't need a reg key + yes the game is still in EA & will be for at least another year

lets be very clear, you can't install offline patches over the top of Galaxy installs... it MUST be all offline patches or only Galaxy patches and they must be installed in order [see image patch]

Submission means the patches are part of a set i.e, your system unpacks patch 1, then patch 2 etc and installls them only after it has all the parts

imo people with crap internet should not install the game because every hotfix and patch is a big download and its going to be a long time before we get a stable finished game to keep... its your money but that is my advise

you can test a tool called innoextract, this tool extracts the gog.exe installers so you just need to copy/paste the files into your game folder.