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Nigel I just tried to open MLK (it worked yesterday) and it said it was unregistered. I upgraded to 12.01 professional last year and upgraded to 12.04 when it was released. This morning I tried to enter the seriel number and got the message RG77V Error please contact support I am in the middle of a project - what is causing the problem? Thank you
I reloaded the full version and still received the RG77V message