The music from Congregation will be available on Bandcamp for purchase and download. It will be split into three releases, each covering one part of the Congregation live concert. This is the music only. The full concert with video, mid-scenes and bonus content is so far a Blu-ray only exclusive.

But if you want the songs only to listen to, here they are:
https://darksidecowboys.bandcamp.com/album/congregation-part-i-initiation