The %appdata%/Roaming/Strive for Power 2/mods folder is not in the main game folder.
To find the "AppData" folder in Windows, you can:
There is a pinned post in the General Discussion https://itch.io/t/2436951/discord
Hey Chris, just wanted to point something out. Ever since the introduction of the spirit system, I've noticed your mod has a somewhat minor drawback for marriages and whatnot. Any child born of a slave is automatically "Trained" and unless there's an item strive introduced to be able to reset training, I'm pretty sure it hard-locks your progeny into an untrainable pre-trained state, if that makes any sense? There's a way around it of course, albeit tedious. If you do servant quests and buy writ of exemptions for freshly recruited slaves, and train them to subordinates you can still buy your way to levels, however, you can't get any specializations. As they're subordinates, not slaves and thus don't require training. Although I suppose the far simpler method would be to only have children with subordinates and not with slaves. But where's the fun in that? But yeah, just figured I'd let you know in-case you've yet to encounter this particular issue.