My App Store keeps saying this item is free in the store, that this item will be added to your purchases and it then says cancel or download.
I click download and it won't download and keeps popping up the same message over and over again. How do I make it stop? I can't download any apps.
Apple's servers were very overloaded with the iPhone 6 preorders.
The official system status page for Apple shows that things have cleared up, so most people with problems installing or downloading things can reboot their devices and then try again to get proper download and purchase behavior.
Expect some slowness this next Wednesday the 17th through Friday the 19th of September with iOS 8 coming out and iPhone 6 being delivered and activated. iCloud backups and restores should be slower than normal as well as possible store and purchase / AppleID slowness if the authentication servers come under large strain again.
In the short term, you could pause the download or turn off your networking and then sign out of the store. At that point, rebooting and trying again - waiting longer between attempts is a good first attempt. Also, Apple does support users on store download issues - so if you've waited several hours/days, contacting store support might be a next step.
Try Signing out & back in to the Store - from Store menu.
I've seen it happen on iPhones but not a Mac; but that was the cure on the phone.
I've also heard that the Store was having problems due to the volume of people trying to pre-order the iPhone 6 - so maybe just wait it out if you can let things settle for an hour or a day.
It appears that the Apple Store is having problems.
Using the http://istheapplestoredown.com/ shows it to be online, but they had some recent problems with the flood of iPhone 6 pre orders and had to take it down on Thursday. So be patient.
