1. I don't know.. probably yes..ask acustica guys directly via email
2. yes..no problem.. check faq section or manual.. You will have to send a file (after installing) to acustica, wait for response and put the received authorisation file in nebula folder, that's all. easy
3. to all new guys: please try as many new 3rd party libraries as You can before judging if nebula is good or not..(i'm talking about cdsoundmaster, alexb, henry olonga, cupwise - lots of demos to try, but i'm telling You each library is worth having, especially the latest compressors - gemini kultcomp, cupwise rayphlex, eqs: cdsoundmaster amek, henry olonga tapes, preamps..and many many other stuff) good luck!