Safely/Completely uninstall old software

Trying to "clean up" my applications folder. I'm trying to uninstall a coupon printing software that I haven't used in years (since 2015). My MacBookPro won't allow me to use the "uninstall" which is in the software's folder. I get this notification: "Uninstall Coupon Printing Software needs to be updated." Seems it wants me to update an OLD/unavailable software before its deleted. How can I completely & safely remove it?