GOGcli GUI v3.7 update has a bugfix for Serial text saved to file. I have also changed when file names are checked if the WARN option is enabled. NOTE - File names can be checked as a group when populating the 'Game Files Selector' window download list, or just before each download occurs. With the latter being more useful if GOG etc change file names during the download period of multiple file downloads. Previously the WARN option meant no checking occurred. Now when WARN is enabled, the user will get presented with three choices instead of two.
GOGcli GUI v3.6 update has the icon file path and icon numbers, for the UP and DOWN arrows on the 'Game Files Selector' window, written to and read from the 'Settings.ini' file. This allows a savvy user to manually set their own choice, especially where values are missing or incorrect. NOTE - Numbers should start with a leading minus character (i.e. -25), and the path needs to be full.
ADVICE - I have now added a shortish instruction file called 'How I use GOGcli GUI after every purchase etc.txt', which can be found on the main GitHub page for this program.