I downloaded and installed MDK according to the steps in this web page:
www.keil.arm.com/.../
But I got a Unexpected error when I try to activate it, what should I do to make it work?
Sadly, it still doesn't work, and I got this error:
An error occurred during activation: Invalid license server address 'mdk-preview.keil.arm.com'. Please check the address syntax.
It seems I cannot use the community edition, that's really disappointing.
But anyway, thank you for Ronan and Hans' help and quick response.