When I wanted to download the software for the 2nd remote pc, I jused a fake email thinking you already had my real email and I didn't want another set of notices. So I need to change the registration to match the email from the host pc if possible.
Currently there's no such option, but registration email is only needed once, it's a freeware product with no accounts.
Anyway, I've forwarded your feedback to the R&D.