You might be asking: Isn't this game on Steam or mobile? Why specifically the GOG release?
GOG, operated by CD Projekt Red, is famous for its "DRM-free" stance. When you purchase Bridge Constructor Playground on GOG, you are not renting a license that can be revoked. You own the file. You can download the offline installer, back it up to an external hard drive, and install it on a machine that has never seen the internet. Bridge Constructor Playground -GOG-
If you are booting up for the first time, here are three pro tips to save you from "Bridge Rage." You might be asking: Isn't this game on Steam or mobile