DB2 Setup Launchpad is not showing "Work with Existing" option.
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Let's say you are installing DB2 9.7 FP11 on a Windows server which has existing DB2 copy and you might encounter a situation where DB2 Setup Lauchpad doesn't show "Work with Existing" option.
In above screenshot you can see "Work with Existing" option is not shown despite having DB2 9.7 FP2 installed on the server.
DB2 Setup launchpad uses db2lp.js file to determine displaying of "Work with Existing" option.
The entry "ese:0" in db2lp.js file shows that there is no ese copy already installed which could be updated thus the "Work with existing" option is missing here.
So the workaround here is to use the silent installation (i.e response file installation) instead of the GUI-installer.
Response file installation of DB2 overview (Windows)
Editing a response file (Windows)
IBM DB2 LUW Lab