Downloaded and tried to use auto root file you have linked. Didn't work. In ODIN, gives MD5 sum doesn't match error.
I did try using an old CF-Autoroot that I had, that didn't work either.
I then downloaded it from the CF-Auto-Root Repository site, and viola. Worked like a charm.
I was on MK2, rooted. I had to flash back to MK2 stock, using the file supplied within a tread, (it ain't hard to find), cleared Google Framework and plugged in to charge, checked for Samsung Update. Update to 4.4.2 installed. Had a brief problem when after rebooting and upgrading apps, my screen remained black. I knew it was doing something though because I have pushbullet installed, and was getting the notifications on my PC screen. But a reboot fixed the black screen. I then tried the first two root attempts mentioned above. Then the one from the Repository. Now I'm good to go.