
The buildbot is doing round 2 of the 1.7.7 release rollout. It will likely take hours again to be finished with them all, but you'll get a better endproduct out of it in the end.
In the meantime, here is an early release of a pre-alpha version of RetroArch for UWP/Xbox One! Please be aware that this is very early days - and read all about it in this blog article -