MoviePlus X6 was designed for Windows 7 and Windows 8. Running it on Windows 10 or Windows 11 can cause registry errors that mimic activation failures.
If you have a working installation of MoviePlus X6 on an old computer, you can manually export your codec unlock codes to a new machine: serif movieplus x6 unlock codes
Serif utilizes two distinct validation strings during the lifecycle of MoviePlus X6: MoviePlus X6 was designed for Windows 7 and Windows 8
If you bought the software before 2018, you can often retrieve your key by entering your original purchase email at the Serif Legacy Product Keys page Affinity | Forum 2. Transfer Feature Unlock Codes (The "USB Method") If you have a working copy of MoviePlus X6 Transfer Feature Unlock Codes (The "USB Method") If
You will get better performance, more features, modern format support, and zero legal or security headaches.