I want rid of this software off my Mac.

Can anyone tell me how to do this?

There's no professional uninstaller included and so the assumption is that once downloaded the user will want to buy.

If you're going to be professional and expect payment then be professional and include an uninstaller. I appreciate being able to evaluate before buying but once this installed....................

Open the QRecall application.

Holding down the Shift and Option keys, choose QRecall > Quit and Uninstall from the menu.

Complete uninstall instructions, including a manual procedure, is in the help. See Help > QRecall Help > Advanced > Uninstall QRecall.