Ok. This problem has been asked 1 billion times but rest assured I have tried every single method including trying to install via the CMD line: dism /online /enable-feature /featurename:netfx3 /all /source:e:\sxs /limitaccess (and variation in caps)
I always get an error at 65.8% which said it could not find the source file. I have done the sfc and dism healthcheck stuff too.
The thing is I never had a windows 8 install media. I bought the windows 8 key from Microsoft store as an upgrade. The upgrade advisor installed windows 8 automatically from my previous windows 7 os.
I have tried a number of online windows 8 iso (64 bit) downloads but none of them work at all.
Any ideas on how to fix this?