Modifying indicates a need to introduce changes either by adding new features or by modifying existing, installed features. It may also mean you need to make changes in the specifications or configuration of the installed product.
The Welcome screen presents options to Modify, Repair, or Remove.
If you execute the same Installer a second time, the Installer detects this and presents options to modify, repair, or remove.
Note: Message Queues such wsworkflow, wsreporting, wsinfra, and wsautorunfile queues are created by the server installer. If you delete any of these queues, they must be recreated by running Modify on the server installer.