Sorry for my slow response.
1) Yes, the library of user-material model is available with with a very significant academic discount.
2) No, you do not need any compiler
3) I have not studied pur-foam, but I have analyzed many different types of closed-cell and open-cell foams. The models in the PolyUMod library should work very well also for pur-foam.
4) I think that the MFM or the TNFM would be excellent candidates for your material.
If you are interested, send me a private message and I will send more information. I can also provide a trial license if you are interested.
Jorgen Bergstrom, Ph.D.