How to: Windows Identity Foundation 3.5 in Windows 10
windows 10 dynamics crm wif windows identity foundation
If you need to install Windows Identity Foundation (WIF) 3.5 and you're using Windows 10, no need to try and download it. It's now part of Windows 10 but you need to enable it in Programs and Features.
Once you click OK, it's installed and voila you're good to go.