Unable to download apps from the app store to my macbook air-error message: apple could not verify the pre-flight code
I am currently using OSX Version 10.9.5 on Macbook Air from mid-2013. I am unable to download apps from the app store. Each time I try-no matter what the app I get a message: "Unable to download. Apple could not verify the preflight code". Does anyone know why this occurs and/or how I can fix the problem?
Thank you in advance!!
MacBook Air (13-inch Mid 2013), Other OS, OSX 10.9.5