This new version of iNMR, appearing on Nov 12, runs on Windows 8, Windows 7 and Vista SP2. Sorry for the mass of loyal XP enthusiasts, it happens that the world goes on.
You get a lot of things for free: fast processing, both manual and automatic, amazing graphics (really the state of the art), batch processing, overlay manager, extraction of J couplings, generation of reports, free-hand annotations, line fitting, simulation of spin systems and of exchanging systems (with fitting to an experimental counter-part), generation of tables, synchronization of spectra.
If this is not enough, if you register for free today, you will be able to download and run all the future versions that will appear during 2013. They will bring a cross peaks manager and a script interpreter.
For the moment being, there is a single edition of iNMR for Windows and it's 32 bit.