I had upgraded to Debut 1.6 not knowing it was a pay upgrade.
So, I uninstalled 1.6, rebooted, and reinstalled 1.50.
Now when I enter the registration info a window pops up with 'Old Version Key'.
This was working just fine for a long time (e.g. was able to use mp4 and .mov encoders).
I did try a version 1.4x install, but it didn't like the key either.
I need to get v 1.5 working again with .mov and mp4
Steve