Win 7 sp1 / UE crash on Fortnite launch

To keep it short and sweet having an issue installing current version of UE4 4.20.1 apparently missing SP 1 for win 7 although i’m sure I have it could be wrong though up to date on all my updates. Other issue i’m having is on launch for fortnite video driver crashes although it says i have the version of my drivers it wants. Any help here would be great just looking to get it where I can play.
Using win 7 (up to date through windows update)
running AMD 4G R7 370 VC with drivers up to date with what it recommends 18.7.1
rest of my system should be fine but can provide details if needed.
Thanks for any assistance!
(oh and i have tried comparability modes and running as admin as well)