- Current recommended is 2010.3r2. This is a stability / bugfix release. There should be another such release based on 2011.X sometime in the next half year.
- Yes, you can upgrade directly. Make sure to take a backup of your DB first
- Step-by-step instructions are in the installation guide
- The offline server upgrade together with the regional server upgrade should do the trick. There are specific steps to be followed and command line incantations to be used for offline upgrade - see the installation guide
Keep in mind that the Dev/Gui server password needs to match - should the upgrade process ask for it, give the one that's already set (see guisvr.cfg and devsvr.cfg).
Keep in mind NSM client in Vista/7 requires that you install as admin and run as admin.