Users running any pre-release versions of Windows Home Server Power Packs will need to take actions to prepare for Power Pack 3. The prerequisite for successful download and installation of Power Pack 3 is to be running correct version of Windows Home Server with PP2. If you’ve a beta version or a release candidate version of a PP installed, you must uninstall these preliminary versions before you install PP3. First, you’ll need to Remote Desktop into your Windows Home Server. Below’re instructions on how to complete this step for Windows XP, Windows Vista and Windows 7.
For pre-release versions of Power Pack 3:
- Access the Windows Home Server Administrator’s Desktop using the Remote Desktop instructions.
- Navigate to the Windows Home Server Power Pack 3 Beta folder at Start > My Computer > D: > Shares > Software > Windows Home Server Power Pack 3 Beta.
- Run the Uninstall.cmd file to un-install Power Pack 3 Beta. After reboot, your Home Server will revert back to your previous version.
- Re-install the updated Windows Home Server Connector software on your home computer. (Windows Home Server Connector installation)
Full Article: Windows blog