Hello as the title suggests for some reason even changing the drive letter to D shows it does not have enough disk space when in fact it still has over 100gb of available space. I also dont know why it shows
F when i dont have a drive with a letter F please help . thanks. attached is a screenshot i took

Nevermind i just changed the settings
of the gog client itself its default was on F

inside galaxy in the upper left click on the down arrow right next to the gog.com symbol and go to settings.
Most likely your temporary download folder is directing to that "F" drive (check my screen shot)