Additional Notes from user Vecima:
I own two Download Manager Pro Licenses; one of them I had on a development server but moved to actual production site and now that key reports as invalid. I purchased a second Download Manager Pro license for which that key will not save on a fresh WP install (see my other post on that issue).
Suspecting that both of these problems could be due to domain association confusion, I tried to lookup the domain associated with each key and found no domain listed for either license.
So, I need to get my original license returned to “valid” status and I need to be able to activate the second license.
Please help, thanks.