If you have PDF Generator already installed without Acrobat, and you decide to install Acrobat at a later date, you will need to install Acrobat on the LiveCycle server, and then run the following steps in order to configure it to run with PDF Generator:
1. Run the PDFG configuration utility that comes with the LiveCycle installation. You'll find it at:
[LC Install Folder]\pdfg_config\Acrobat_for_PDFG_Configuration.bat
2. Double check to see if the Acrobat Environment variable were actually added (the batch file should have added them).
3. Once all of this was done re-run the config manager, but only select the option to configure the installed LiveCycle components and you would not select Content Services if you do not wish to have it on there.
At this point Acrobat should be fully configured with PDF Generator.