I installed UMM following instructions from, I think, the nexus website. Part of that was to create a folder named Pathfinder Kingmaker in my Applications folder, and then in the PK folder a folder named "Mods". Then I dropped the unzipped mod in the mods folder and started the game. Worked fine, at least with the turn-based mod. I'd guess the respec would work the same way. However, I'm on a Mac; PC procedure may be different.
RPG Community College has a youtube video on the turn-based mod that talks about how to install mods. Not sure if it's PC or Mac based, as I haven't watched it yet.