if anyone is still interested, here my solution:
1. start a manual installation of pl/sql developer via plsqldevxxxx.exe.
2. go into your temp folder (eg. %localappdata%\Temp) and find \WZSE*.TMP\pls
3. copy the folder to wherever you or your deployment software needs it
4. cancel the manual...
why would this be a case for the support? i have exactly the same challenge. we want to deploy a sccm package for pl/sql developer, and installation is fine as such. but i don't see any possibility to provide an installation with the corresponding license key. we really don't want our users to...