[Q] Kit-Kat roms topic

Is there a special procedure I need to upgrade to a Kit-kat rom?

I'm running 4.3 rom (Jellybam) however when trying to to upgrade to their 4.4 build I had a status 7 error. Then I Tried tamskeys CM11 build and the install aborted also, I don't know the cause for these failed installs.... Please help..

Thank You