So, I've taken a break of my windows 10 Testing, to make a windows 8.1 and update my main machine. Somehow, the latest version refuses to activate net 3.5 though, try as I might. it doesn't give any errors though, it just skips it on the final batch. Same ISO image, on another machine (an old, testing one), on NTLite version 1.7.5.6842, does the proccess without complaints.