will not download

i have the latest OS X (el capitain) and every time i try to download from the app store I get the same error message that doesnt tell me any particular error has occurred, just that an error has occurred. it wont download and no one at apple knows anything about how to fix it. ive spent five hours on the phone (most of it on hold as they transfer me to another person while they start the whole cycle of questions over again, never getting anywhere) with them the past two days to no avail.

Bobo12321289 about Rome: Total War - Gold Edition