KHP 4.103 install problem

[cartero]

I've installed KHP, but it won't run. I went through the entire install process - registration verified, installation completed and finished. However, when I try to run the program I get a message stating that my registration information doesn't match my serial number and that I must reinstall the program. I did reinstall it once, but with the same result.

I entered the correct email address and did a cut and paste for the registration code (no trailing spaces) so I know that info is correct. What else could be causing this problem?