If you wanna beta of Remote Desktop 3.6 Admin and want to use version 3.5 on Mountain Lion DP3. It will be helpful for you and it need a trick for working.
If you already have ARD in Mountain Lion, just skip to 3.
1. install the version of Remote Desktop 3.5 Admin . Then upgrade to 3.5.1. 2. download and install Pacifist that help you. 3. go to download page update Apple Remote Desktop Client version 3.5.3 . 4. open the package with Pacifist and selecting the root of the package and click install. 5. restart the computer and Remote Desktop running!