It is not possible to uninstall a Denodo update.
To be able to rollback to an installation with a previous update after installing a newer update a complete backup of the installation must be carried out prior to the installation of the new update to be used in case a regression to the previous update is needed.
If you have not carried out a backup and using an update previous to the currently installed one is needed, the recommended approach is to perform a newl install of a second Denodo Platform. Then install the update needed in the new installation.
For more information about backup installation see Installing Updates and Hotfixes.