Have you installed .NET 3.5?
It is required to run Zwift.
Here is a helpful link: https://docs.microsoft.com/en-us/dotnet/framework/install/dotnet-35-windows-10
ave you tried Control Panel>Programs and Features
On the left side click on Turn Windows features on or off
The first one should be ,Net Framework 3.5
Also, try this link: https://docs.microsoft.com/en-us/dotnet/framework/install/dotnet-35-windows-10
You could also try this:
DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:d:\sources\sxs
Where the Source:d was the dvd I used to do the tech review installation (d: should be the drive with the windows 10 tech review installation software)