- Plesk 11.x for Windows
Plesk upgrade failed with error while upgrading from 11.0.9 to 11.5.30:
'MSI: Error! The older version of Parallels Panel upgrade assistant cannot be removed'
upgrading Upgrade Assistant...
MSI: Error! The older version of Parallels Panel upgrade assistant cannot be removed. Contact your technical support group.
Failed to install 'C:\\ParallelsInstaller\\parallels\\PANEL-WIN_11.5.30\\dist-msi-Microsoft-2003-i386\\upgrade-assist.msi': Fatal error during installation. (Error code 1603)
Error: The installation of the package 'upgrade-assist' failed with code 1603. (upgrade: upgrading Upgrade Assistant...)
Not all packages were installed.
Please, contact product technical support.
The Plesk autoinstaller had been configured to use custom mirror which does not have upgrade-assist.msi file.
upgrade-assist.msi is missing from Plesk installer packages of current version.
For example, if you are trying to upgrade from Plesk Panel 11.0.9 to Plesk 11.5.30,
(or other packages in error) is missing from
Make sure that all directories in
contain the msi package
If some directory does not have
package of the same version you can get it from
and proceed to upgrade the Plesk.