So I am very new to GOG, I just got the Ultimate edition of Cyberpunk yesterday and I went to install it and this obviously went to then download Galaxy first before installing the game with the client. As it was downloading I noticed in the extras that the offline installation files in the extras tab for the game was around 105gb (not including the dlc) compared to downloading the game with the client which was only around 80gbs.

I looked online and I get that with Galaxy you can only play the game with internet access rather than whenever if you use the offline installation which I get, but I am very confused with how to proceed from here. Is it better to do the offline installation from the GOG store page for the game, or on the Galaxy page for the game? And from there how do you sort the installed files, like on the store page there are 28 separate files to download, once they're all downloaded are they extracted to one file, or something else?

Most of what I have seen online is people just saying, hit download like there is only one button for it, or other people talking about how Galaxy is terrible and to avoid it at all costs.

Edit: Additionally just to check, if I am just installing every file from the store page, do I also download every single patch, or just the most recent patches?