Yes the software is ancient (last updated in 2013 to v1.14.3).
Where are you trying to download SNET from? (It should be Locate an HVAC Contractor Using SNET Pro 2 Software | Samsung HVAC for v1.13.9. You have to get v1.14.3 from the Samsung Helpdesk.)
And what if any files do you see after you have unzipped the download? (On a native Windows machine you would get a C:\Program Files (x86)\SNET pro2 folder.)
Depends on whether you have an F1/F2 sniffer. Assuming you have, you can for example write to F1/F2 using SNET (e.g. FSV changes) and watch the NASA traffic using your sniffer (Request and Acknowledge packets). That is, you can map FSV numbers to NASA registers. This mapping is already well documented for pre-Gen7 Samsung controllers, but from what you have reported above and elsewhere, it sounds like the MIM-E03FN (or whatever Gen7 uses) has a different mapping.
I recall giving a bit more background to NASA packet construction in Samsung ASHPs: Customising Your SNET-Pro2 Display. It’s probably too simplistic for you, but it might pay you to have a quick read of it if you do manage to fire up SNET.