I‘ve checked a few of the resources I found here but I seem to be unable to wrap my head around this.

I want to play one specific game purchased from GoG on my Steam Deck. It only has a windows installer. I don’t need a fancy launcher (at the moment). The game has low hardware requirements so should run fine via emulation/proton…

What’s the easiest way to install and add this game to game mode?

Edit: clarification on the launcher. I don’t necessarily need one. If it is the easiest way to get it done I still would consider installing one.