Clarify limitation of the latest Windows binary

[er-pa]

The latest version of Syncthing is available as download in the Downloads-page. However, this version requires Windows 10+ or Windows Server 2016+. It would probably be a good idea to note this limitation, as nothing indicates this currently.

As a bonus, perhaps it's also good habit to add some sort of link to the forum or a quick step-by-step guide on how-to downgrade ánd disable auto-upgrades for the OS-versions which cannot run the latest version of Syncthing.

[bt90]

We could add a more general warning that we only support non-EOL OS versions. I've seen enough questions about old Mac versions, or people trying to run Syncthing on kernels that belong in a museum, to know that this is not a Windows specific problem. Otherwise we'd have to constantly update this page to mimic https://github.com/golang/go/wiki/MinimumRequirements

[er-pa]

That works too and would be a bit more maintainable, sure. At least some clarification/warning regarding this subject would be great.

[calmh]

I think copying the relevant information from that page once every six months or so wouldn't be too arduous if we wanted to. More valuable, perhaps, would be a set of links to the last version that will run on each unsupported OS...