Authorize on two computers - how?!

Hi all.

I'm new to this forum and I hope I didn't miss a topic or thread that would probably already have my question answered. (Did a search, but to no avail...)

I just installed EightyEight 2.5 as well as Xpand!2 and they both work like a charm on my iMac and Apple's MainStage.

Now, when I'm done editing sounds on my iMac, I usually transfer the related files (and the virtual instruments) to my MacBook Pro to take them to the rehearsal room. But apparently I'm not allowed to install EightyEight and Xpand!2 on my MacBook, too. When I try I get an alert saying "Enter a different serial number". But I just have the one I have...

What am I supposed to do? Do I need to buy another license to have the software run on both machines?

Thanks for your ideas and regards from Germany!
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