I was having the re-activation error, so I uninstalled 2017. Now when I try to install 2018 SP2 it gives me Error 1325.vcprojects is not a valid short file name. I have tried loading this several times in admin mode and without. I have read some google searches and they suggest modifying the Register, and I was hoping that maybe there was an easier fix. I am using Windows 10 64 bit.