How to revoke license from old machines - version 2.7.17

Hi everyone!
I’m still using old and trusty MarginNote X version 2.7.17.

I have replaced a couple of older more or less broken mac mini’s, and want to reinstall MarginNote on a 2010 Mac Pro (High Sierra).
I am running into problem of “Registration count exceed the limit”

How can I revoke licenses from the old machines?
Is there a way to revoke all licenses so I can start counting while re-adding to machine that I really use?

Thank you for helping out!

Hello

Hello, you need to send us the activation code to help you restore it.

Kind Regards,
MarginNote-Relight
Support Team

Hello, thank you for your reply.
I have forwarded mail with purchase info, lic. name and key.

Thanks for helping out!

Hello, I have sent you a copy of the mail that I received when I purchased my license of MarginNote X on February 3rd 2021 but have had no reply since. Could you please look into this? Mail was sent to service@marginnote.com

Thank you.

Hello

Hello, which is your email address?

Kind Regards,
MarginNote-Relight
Support Team

Hi,
This is my email address:
domusbvba@fastmail.fm

Thank you for helping out,
Kind regards,

Erwin Panen