Documentation is always a problem. I am very sorry about that.
Yes. CloneDVD2 is just newer. I believe CloneDVD2 was the first version, which supported splitting.
No problem, because there is no activation like DVDXCopy had. I hate programs requiring activation. It causes trouble if you change OS, computer, etc.
Just keep your registration files or the registration emails as in a safe place (floppy disc, CD, USB stick, whatever)
Online one year for free. But I don't think they ever check.
You should uncheck Autostart in the AnyDVD Tray Menu to have the same effect.
No. But there are guides available.
Leave them checked. The "confusion" is only hypothetical. Never ever have seen a problem, and the results are better, if these options are checked.