I started to suspect TV Mosaic was dead also - I had to move a license from one machine to another and it took over a week to get a response which I took as a bad sign.
I set up a TV Headend server and began getting it ready to take over on my clients. I'm happy to say that TVH has some great clients for IOS and Android TV now which makes it so much more viable than before. I use PVR Live on Android TV (which also has TV Mosaic support) and it works perfectly.
Might be worth looking into TVH - it is more complex to setup but also very flexible.
TVMosaic live and recorded TV products for Desktop/NAS/Raspbery Pi