Grasshopper for Rhino 5.5.2 on MacOS High Sierra 10.13.1

Hi there,
does anybody knows what I have to do, that Grasshopper is running for Rhino 5.5.2 on MacOS High Sierra 10.13.1??
Typing the command “Grasshopper” does not work.
Thank you

Please run _ValidateLicense. Grasshopper will only run if your license is validated.

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