Option 1:
You can get the trunk version of FluentNH in binary form here (no NHibernate Linq included):
http://www.hornget.net/packages/orm/fluentnhibernate/fluentnhibernate-trunk
You can get the older NHibernate Linq provider in binary form here:
http://www.hornget.net/packages/orm/nhcontrib/nhibernate.linq/nhibernate.linq-2.1
I believe those are both built against the same version of NHibernate, so they will be compatible.
Option 2:
The HornGet version of FluentNH is not built against the trunk version of NHibernate. If you want to do that (to get FluentNH with the latest NHibernate Linq provider), you can use the Hornget version of the NHibernate trunk and build FluentNH from source against those NHibernate binaries.
You can get the trunk version of NHibernate in binary form here (latest NHibernate Linq included):
http://www.hornget.net/packages/orm/nhibernate/nhibernate-trunk
I was able to use Git to pull the FluentNH source and by mucking around with the project files, I was able to build the trunk of FluentNH against the trunk binaries of NHibernate without using Ruby/Rake. I don't believe I even needed to use NAnt or msbuild, just Visual Studio.