Got the following ERROR after installing the new MYTHIC
 

Got the following ERROR after installing the new MYTHIC PACKAGE...

The data files could not be loaded due to errors. Hero Lab will now attempt to load them in recovery mode. Once loaded, you can access the editor as normal to correct any errors.

The following errors occurred:

Thing 'cHelpSon' - Condition phase/priority (First/5000) for bootstrap thing 'cSonChElAE' occurs after earliest rule/script (First/2500)

You have a custom .user file with a class abbreviation of "Son". On that class you are bootstrapping cSonChElAE at 5000 timing. You can't do that anymore with the new update. As the message says the earliest timing is 2500. You need to open the .user file and change the bootstrap conditions from 5000 to 2500.

Until you do this NONE of your .user files will load as HL is currently running in safe mode.

There is a thread about this error here, and a new release was shown here.

The simple answer...you did not update the FGG Pathfinder Content files.