Just to answer your question of loaction of opm.db file in MaC:
Delete opm.db file located at :MAC : ~/Library/Application Support/Adobe
(opm.db file is present in your user library.This library is hidden from MAC 10.7 onwards.
So in order to locate that,
- Click on Go at the top
- Select Go to folder
- type ~/library/
- This will take you to the library folder and then you can locate opm.db file at Application Support/Adobe)
Regards
Rajshree