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I have uninstalled uVision5, but I still get the link error for using an evaluation copy.
How can I completely remove uVision5 and return to my previous working copy.
But when you reinstall your "full version", you don't automatically get a new license file. So do you have a backup of the original license file? Or how have you tried to enable the license again?
Remember that a valid license can give you perpetual rights up to a specific program version. If you try to install a copies with a newer release date than what your license allows, then the license will not work.
Note also that Keil support is the best route if you need help with licensing issues.