So basically, after I installed STEP (after quite some hours...) I started the game, played a bit, and everything went fine until I came across some missing NPC's.
The first one I stumbled on about was when you first enter Whiterun, the blacksmith lady is talking to someone, but that person wasn't there and she was talking with.. thin air.
The same happened in Solitude, where some father talks to his kid (the kid's not there).
Anyone know what causes this? :)
I appreciate your help!