Mulab on pc forgot that I had pasted my key ; Trying to again paste it: It says my key is expired

[FTTMP]

Hello there, a few months ago I bought a key for mulab licence.
I did not use mulab for a while, so when I today tried to give it a run one more time mulab told me, that I am in the demo mode, although I have implemented my key a few months ago.
I thought: Okay no problem, just implement I just implement my key again. But then it said, that the key is expired. What can I do now?

+Maybe it is because of the fact that I had installed the mulabdemo twice on pc. In one of the both installations I implemented the key, in the other one i did not.

However: Now no version is working with key because key is "expired"
What shall I do?

[MuTools]

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