As I recall, for like the first few months that I had MOTS, it didn't work on the Zone because it would insist that I "only had the demo version installed."
Make sure there is no trace of the MOTS demo no your system before doing it.
It's also possible that this was just a flaw in the Zone software that has been fixed.
Oh, and about playing MOTS without a CD, the only way to make it work properly is with a cracked EXE file, which is technically illegal to distribute here. If you do download a MOTS crack, be warry of virus infections, as some people were passing off infected EXEs some time back.
[This message has been edited by Kurgan (edited June 05, 2000).]