today we release a new client version, called 3.0.0-rc1. As it is a client from the "stable channel" all users coming from beta36 will be asked to update to it through the auto-updater.
For those of you that have not been keeping track of the development of rc1 by using a "beta channel" client (the 3.0.0-rc1-preX versions), there are many changes. The biggest and most invasive is the complete rewrite of the sound system, giving better performance and more possibilities in many areas. Also quite prominent to note is the updated sound pack (we are still working on the effect filter).
If you have any issues, please report them in on our forums in this thread
How to get it
Easiest way is just to update (click Help->Check for Updates). If you like you can also use an installer from our download page.
If you need to downgrade to the old version (beta36) from some reason, you can find the old installers here. Please don't forget to report your issue in the above forum...