I wonder if it's possible to create support packs on top of an existing installation? I realize that one can create an upgrade installer. However, does this type of installation support uninstall feature including the restoration of the files when the upgrade is removed?
asked 21 Nov '11, 12:06
Upgrade installers are meant to be installed on top of existing installation and cause original uninstaller to remove both original and upgraded files. This can be used to install a fix that should not be removed separately.
Regular installers can be used to install changes on top of existing installation. Renaming uninstaller and enabling rollback will cause running the service pack uninstaller to revert files to previous version.
The original application's uninstaller can run uninstaller for service pack in unattended mode before actual installation to properly clean up all files by doing:
This will roll back files to the original version before main application's uninstaller removes all files. This will cause application and service pack to be properly removed.
answered 22 Nov '11, 07:42