Task killer "close all" for Xperia M 4.3 topic

I installed two apks i found of the sony.taskkiller.com in my c1905 non rooted n' locked bootloader, as i understood it worked w/out root, it installed correctly + rebooted but the button didn't appear anywhere on the screen, but it was installed. The question is how do install it w/out rooting or doing developing things?

Thanks in advance:good: