So, I recently purchased a boat that has a state of the art circa 2009 setup. The PC is running XP, and the Expedition version loaded is 7.2, Instruments mainly Ockam - 0183  -- I'm looking to install the gmm model file you have posted, but there doesn't seem to be an existing file in version 7.2. 
I'm also happy to upgrade the license, but I can't really without upgrading the PC/OS to Win10. Since the system is working for now, is there a way to apply the WMM to version 7.2? It is complaining that the model is missing/out of date, so I'm hopeful. 
The PO had put a lot of effort into this system, polars are loaded, sail inventory, there is a lot there. I'm curious also what your suggestion is for upgrade path.

Thanks,
Sam