You can roll back a version on the server by replacing the current deployment manifest with the deployment manifest of the version to which you want to roll back.
As shown in the figure in Publication of Application Updates, the deployment manifests for each version are saved in the application deployment folder.
Suppose the current appname.application file in the deployment folder is for version 1.0.0.2, but you have found a bug and you want all users to revert to version 1.0.0.1. You can delete the current appname.application file, which points to version 1.0.0.2, and save the appname_1_0_0_1.application file as appname.application.
Users on whose computers the application has been installed for use offline as well as online can roll back to the previous version or uninstall the application completely from the Windows Control Panel’s Add/Remove Programs dialog box. Users can roll back only one update.