Those other DLNA servers I mentioned in most cases have versions for Mac and Linux as well. So even if you used a Windows version now you could switch to a Mac and use what you are already comfortable with.
Yes, Windows 7 support is ending soon. I think they'll be supporting Win 10 for quite some time, since they haven't released a completely new OS since then.
Nvidia Shield, Roku Stick (3600), Ultra (4640), Premiere (3920), Insignia 720p Roku TV, Sharp 4K Roku TV, Windows 10 Pro x64 running Serviio and Plex on a wired Gigabit network.