How do you go back to 3.40?

[computex13]

I upgraded to 4.03 and, so far, everything looks good. It rebuilt my database but did not convert my zips. I guess that is correct going from 3.321 straight to 4.03. I have 4.04 but was going to wait for 4.05. Everyone says that if you have problems with 4.X you can go back to 3.40. Where is 3.40? Do you reload 3.321?

Thanks,

Mark