Hi Pete,
I’m having the same issue this gentlemen is having. I purchased via SimMarket (discounted as a long-time FSUIPC customer/user). I entered all the registration details as required in the installation process. When I go into P3Dv5 and open FSUIPC6 via the ADD ONS tab, I only see two tabs. It says I’m using an unregistered version of FSUIPC6. There IS a pop-up telling me to uninstall FSUIPC6 via the installer and reinstall, entering the registration details EXACTLY as they appear in the order details email (via cut and paste). I’ve done this twice with the same result. Your help will be greatly appreciated.
PS...please excuse the CONTACT US email I sent. I didn’t realize that I wasn’t a registered forum user. I am now.