First of all, if the only thing you did was run the Reactivate License wizard, nothing will be touched with regards to any data files. The only way that data files can be mucked with is by retrieving an update to the game system data files. So I'm going to assume you attempted this at some point.
All user-created content is kept completely separate from the official content. User-created files are stored in files with the ".user" extension, while official content is stored in files with the ".pkg" extension. This ensures that no user-created content will be accidentally clobbered when an update is installed.
Once the new update is installed, it's possible that a conflict will exist between user-created content and newly added official content. If that occurs, then an error will be reported to this effect when you next try to load the data files. You will be told that an error exists, after which Hero Lab will exclude the user-created files and try loading again. If this happens, your user-created content is still sitting there, but Hero Lab simply isn't using it. You can open your file(s) within the Editor, modify them to eliminate the reported errors, and then get your custom content in use again.
There is exactly ONE way in which your custom content can be actually deleted by Hero Lab during an update. Once the new data files are downloaded, you are presented a window that asks you to confirm the import. On the left side, there is a checkbox labeled "Delete files not updated by import". If it is checked, Hero Lab will delete all user-created data files (and any other files), that are lingering around. By default, this checkbox is always unchecked, but users can check it if they want to revert to a "clean" state. If you checked this box, then that would explain the disappearance of your custom data files.
Hero Lab has a safety precaution when deleting files, though. All files that are deleted are first copied to a backup folder. So your files should still be around. The backup folder is named "importbackup" and will be found beneath the normal game system folder. By default, the Pathfinder files will be found in "c:\herolab\data\pathfinder", so look for your files in the "importbackup" folder beneath that location.
Hope this helps....