I upgraded from 2.05 to 2.50 because of security breaches. 2.50 was maddeningly slow and the interface was "retro." I was searching for an old 2.05 on the internet, willing to take my chances with the spammers just to get my program back when I ran across 2.51.
My congratulations! You're back on track, though I did feel like I was a beta-tester on a painfully slow old PC instead of the 64 bit Quad Core that actually runs my software.
As they say, "All's well that ends well [after it ends well]."
Thanks for the upgrade...