I don't use that one, but if you have any qualms about removing your existing security, all you have to do is download and save. then go off line.
remove your old stuff and install the new.as you obviously had no trouble installing your present security, you should have no problem installing the new.
Somebody may give you some info about the correct way to uninstall your present stuff, without problem.It obviously has to be uninstalled if that's what they recommend.
all the best.