Install lgogdownloader by entering the following commands in the terminal:
sudo apt update sudo apt install lgogdownloader
Description:
downloader for GOG.com files
lgogdownloader is a client for the GOG.com download API, allowing simple downloads and updates of games and other files from GOG.com. . This package is only useful if you own games on GOG.com. There are a few free-as-in-beer games available for Linux, but the DFSG-free games available on GOG.com are not provided for Linux and are available in Debian anyway (lure-of-the-temptress, beneath-a-steel-sky, flight-of-the-amazon-queen).
Homepage: https://sites.google.com/site/gogdownloader/
Version: 3.3-1build1
Section: universe/web