When you upgrade the Presentation Server to 10.1, the installer automatically backs up the installation and configuration files of the Presentation Server 10.0 installation in the following folder:
The installer copies all the installation and configuration files of the Presentation Server 10.1 installation in the following folder:
If the upgrade is not successful, perform the following steps to restore the earlier version of the Presentation Server:
(Microsoft Windows) Open regedit and edit the display version settings to
10.0.00 stored in the following Windows registry key:
In a high availability deployment, if the upgrade is successful on the Primary server and fails on the Secondary server or the reverse, you must restore the earlier version of both Primary and Secondary servers.