FYI – you don’t need to downgrade… you just need to add the older versions through windows features upgrade.. it’;s free and takes 5 seconds to do.. exuding the upgrade.
http://anewdomain.net/2013/10/21/how-to-enable-net-framework-2-0-and-3-5-in-windows-8-1-for-older-programs/
This works for Windows 10 as well.
