Groove Agent SE 5 - Content missing

I get this error message when launching Dorico 5.1 - I also got this message with Dorico 5. In the Steinberg Assistent it only says “install again” after it has been installed, but obviously something is missing on my MacBook. Does anyone have an idea how to fix it (without only deselecting the error message)?

You need to find and install Groove Agent SE 5 – Content (recommended) as shown in this picture:

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