Why not get the game before ask for mods workshop. It wasn't like you can use workshop here even if you may said you play gog version.

Not gonna happen, sorry; as per the FAQ (check it out here: https://gtm.you1.cn/app/365360/discussions/0/620712364025411221/)

"Although we would have liked to support modding beyond what is currently possible, early on in the development of Battle Brothers we had to make tough decisions to get the game made at all. These decisions can't be undone anymore, and that's just the way it is. If there is ever going to be a Battle Brothers 2, it'll have full-fledged mod support for sure."

In case you missed it, there are many great mods and they are incredibly easy to install, and importantly, uninstall. Really, even easier than the workshop.

You can find hundreds of mods for BB on nexusmods website