A friend of mine has been waiting since the last release for it to automatically update. How long does it take for the program to find it and update the program to the newest one?
I think that the 5.1.864 update is on hold, given they are working on fixes released in the 5.1.664, 5.1.874 and 5.1.884 pre-release builds.
The last pre-release build, 5.1.884 is expected to be released very soon as a regular update release, this would mean 5.1.864 would effectively be skipped for those that don't have it already.