I cannot deauthorize all computers
I'm changing to new laptop and installing iTunes but it pops up that I cannot authorize more than 5 computers and I have to deauthorize any of them first. Scrolling down of the help page and found "deauthorize all computer" then I opened the ex-laptop and followed the step but after "sign in" I didn't see the box to deauthorize all computers which was remarked that if I don't see this option means I have authorized only 1 computer. ?!?!
I don't get it. While the pop up in the new laptop says it doesn't allow me to authorize more than 5 computers but I couldn't deauthorize all computers because I have authorized one?
Pls. advice.
iPhone 4S, iOS 7.1.1