This page will help to troubleshoot and point out the solution to common problems people might encounter while using TouchCopy.
To learn how to use an iPod Classic without having iTunes, please read the entry here.
You can then proceed copying your iPod to your computer as detailed here.
If you don't have your original registration email, there are ways by which you can retrieve the details so that the program can be installed again. Read about it on this support article, here.
It may come a time where your activation code doesn't seem to work. If this happens, don't panic. You can read our support article, which explains exactly how you should proceed. Read about it here.