New to this forum, with very little experience...

I have an opportunity to buy a TAC 20 elevator that is "new-in-box", apparently designed, engineered, and specified, but never installed. The individual selling it appears to have less knowledge than me. Wonder if someone could answer a few basic questions:

First, is this a model that is still supported?
It was engineered for two stops, I need three. Is this possible?
How difficult will it be to obtain installation and service help on this, since I did not buy it from a TK Dealer?

Thanks for your kind assistance.

David Walker