Database upgrade problem

The problem is that you're trying to upgrade from EV 11.0.1 straight to EV 12.4.2.

Your log shows:

Enterprise Vault directory. The database needs to be upgraded from '11.48.0.160.0' to '12.132.8.249.3'.

11.48.0.160.0 is the schema version of the Directory DB for EV 11.0.1 with no CHFs.

12.132.8.249.3 is the schema version of the Directory DB for EV 12.4.2.

(https://www.veritas.com/content/support/en_US/article.100020901)

You cannot upgrade to a maintenance release (i.e., a triple-dot release like 12.4.2) from a previous minor version (i.e., double-dot release like 12.3). You can only reach 12.4.2 after you have already reached 12.4.

In your case, you should reinstall the binaries from the EV 12.4 full installation media, then run the Start-EVDatabaseUpgrade cmdlet to upgrade the databases to the 12.4.0 versions (Directory schema 12.132.8.249.0). Once this is complete, then reinstall the EV 12.4.2 binaries and run the Start-EVDatabaseUpgrade cmdlet again to upgrade from 12.4.0 to 12.4.2 (Directory schema 12.132.8.249.3). This is a supported upgrade path and should meet with more success.

Good luck!

--Chris