VERIFIED SOLUTION i

How to safely revert back to a previous Hotfix version in Portrait Dialogue


 
Back up the entire "C:\Program Files (x86)\PST\Million Handshakes\Dialog Server" directory before installing HF3.

Most important would be the "C:\Program Files (x86)\PST\Million Handshakes\Dialog Server\DialogServerPlugins" directory, in case there have been any customisations of config files, etc. before updating.
UPDATED:  August 21, 2017