Here are the steps to follow to perform a simple reset of the Heredis preferences:
This is risk-free for your own files.
If Heredis is already running, close the program. Once closed, restart it by holding down the ALT (or Option or ⌥) key. You must hold it down until the Heredis software and the reset notification at the top right of your screen are launched. Log in to activate the license:
(Your version of the software may be different, but its behavior will be the same)