First, click your download link again and get the Microstudio 2.517 version. It was released after you ordered on 01/01/2004.
Then, if you are installing and registering on-line and see an error message text that you are "not on-line" (but you really are), read the top TITLE bar of that error message. If it says something like "wrong email address", then you are on-line, but the email you are entering is not what you must enter.
If you are registering by Floppy Disc on a different computer than the one you are installing on, be sure you enter your Registration Code and Registration Email exactly as they appear in the MTU.com product download instruction email you received. If not, the registration will fail, and via the Floppy Disc we don't have as good error reporting as direct on-line registering.
Let us know if you still have a problem.