Error when attempting to register Elements 5.0 on my new Windows 11 PC

I have an old, reliable copy of Photoshop Elements 5.0 that does everything I need, and I've installed it on my new Windows 11 PC.  It works just fine but nags me to register it.  However, the registration process always gives a Registration Error.  Every time I start up Elements I have to click "Register Later" because it won't permit me to "Register Now."  Any ideas on how to get this registered?