The binaries here are obtained by checking out the source for e12204c6:
https://github.com/weltkante/managed-lzma/commit/3e12204c60ada8164561a841bb8dcb4c96078c99

And building the "master" project in Release mode with Mono.
This is done because there were no released binaries to base it on.
Once binaries are released by the managed-lzma project, they should replace this.