The first RC has just been released. I have made small instructions since it doesn't work right away.
http://macles.wordpress.com/2008/08/12/ ... -released/
http://macles.wordpress.com/2008/08/12/ ... -released/
For Linux, the hardware acceleration feature will not work if you are using a compositing window manager (compiz). In this case, Flash Player 10 Beta will always fall back to software. If you would like to test Flash Player 10 Beta on Linux, please disable your compositing window manager.