PokerTracker

I didn't purchase an Omaha license yet. Is there a way to access the original hand histories from my Omaha hands? I am able to open them until Poker Tracker processes the hands and deletes the file.

PokerTracker does not delete the hand history files. By default your hand history files get archived to your 'Processed' folder which you can access via the 'File -> Open User Data Folder' option on a Windows machine:

Guide: Processed Files