I have an old MDK-ARM Plus License. Furthermore it say "mdk_std" and "Support: Jan 2019". Before installing the update, I would like to make sure if I can use the latest µVisio. I don't have to use the latest compiler. Just the new GUI would be nice.
In this case, you can compare your support expiration date of your flex license with the release notes of MDK versions: https://www.keil.com/update/rvmdk.asp
Your expired license will only support you to use MDK versions that were released before your license support expiration date.