Licence query

I have a license for Rhino7, Rhino5 for Mac, and an educational rhino5 for Windows . I need to use the Rhino5 for Windows to use my old Flamingo V3.0 license for a project. On my account, it shows my Rhino 5 for Mac, Rhino 7 and Flamingo, but not Rhino5 (bought as upgrade from Rhino4).
I am trying to find an email address to show proof of purchase for the license for Rhino 5 for Windows to have it put on my account so I can use it.
Nothing found on the Rhino website.
When I load the software and enter my license key I get this:

How do I get my old Rhino 5 listed on my account?

Hi Hugo -
When I check with your eMail address that you use here, I also only see licenses for Flamingo and a Rhino 5 for Mac that was later upgraded to a Rhino 7 license.
I do see failed validations for an educational Rhino 5 in 2017 and 2019 so there are at least some traces.

Please contact sales@mcneel.com directly to get this sorted as that will likely require more personal contact data from you.
-wim

Thank you for that. Will do.