If Sonos have abandoned the Windows controller (and with it a large number of users who paid for a product) then please consider putting the code into a public repo at Github.
This will allow technically minded users to maintain the application. There are a huge number of very experienced and able Windows software developers - myself included - (I also developed a .Net Sonos API and have some serious insights to this).
I paid for a product, I’m a software developer and work at my Windows PC a great deal, this is the world I live in, not Android, not Apple and was one of the attractions of Sonos at the time I made my purchase.
If we’ve been abandoned or sidelined then I see no reason to remain a loyal Sonos user and will simply dump the product.