We just upgraded to amazing charts 10.0, and the upgrade was successful on all terminals except for one Windows 10 Pro computer where it keeps on asking for installation of the Microsoft.net 3.5. I downloaded it from the Microsoft website, but it is not installing and keeps giving me error code 0x800F081F

Yesterday, I spent 2 hours with Ryan from Amazing Charts technical support and he was unable to install it and he told me to reset the computer/reinstall Windows 10 Pro.

Does anyone know of any other solution to successful install of Microsoft.net 3.5 , short of resetting the computer?