yep......this will not root anything older then 5.0....sorry
plus these one click root methods, i never trust. it is better to do the work and root the hard way. this way you learn the process and by learning, you will lower the risk of something going wrong. one clicks made people lazy and when something goes wrong, they have no clue how to fix it.
anyways, the newer android os's are more difficult to root. this is a good thing as it also lowers the risk of somebody hacking your phone. but is bad as it makes rooting more complicated. also rooting now days is device specific.
if you want to root your device please head on over to
xda developers forum. this is where most of your developers will hang out. they are the ones who look for exploits to root devices and then they publish their findings there.