First of all I would like to inform you that I am not from the quick heal any how and not associated with them any how. I am the owner of this website who loves to share solutions.
Once you have ended the trial version then you won’t be able to avail the trial version from the start-over. In this case, you can only purchase and activate it. This is the only option that I know of. To uninstall quick heal, check out this dedicated page: https://www.techsupportall.com/download-quick-heal-removal-tool-direct-download/