Hi Mothership,

you can use the free version as long as you don't hit the trading restrictions as mentioned in the manual http://zorro-trader.com/manual/en/restrictions.htm

I personally trade my own scripts - one running on a free amazon vps - on a fxcm demo account. You could do that live(with real money) with the free version also, but i recommend trying on a demo account first:)
I see the whole thing as a hobby - and don't intend to go live until i managed to step into every possible trap there is:p

Ah yes, if you have 3-4 strategies, you need 3-4 vps's to run with the free version - or you combine them into one or two strategies, or, you buy Zorro S.