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MDK V4 project legacy support not working

I have an MDK V4 project that I am trying to open in a new install of uVision V. I get the following dialogue: https://imgur.com/fMKvf1X

"This is an MDK Version 4 project requiring device support for Cortex-M based devices."

I clicked on "Install Legacy Support" and downloaded legacy support for Cortex-M devices from www2.keil.com/.../ . I installed it and Keil gives me exactly the same message the next time I open it.