Failed to verify the preflight file. It is not signed by Apple.
i cant use app store for get app and update my os
MacBook Air, OS X Mavericks (10.9.5), 2013
Apple Event: May 7th at 7 am PT
i cant use app store for get app and update my os
MacBook Air, OS X Mavericks (10.9.5), 2013
Please launch the Keychain Access application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad and start typing the name.
From the menu bar, select
Keychain Access ▹ Preferences... ▹ Certificates
There are three menus in the window. Change the selection in the top two to Best attempt, and in the bottom one to CRL. Log out, log back in, and test.
Failed to verify the preflight file. It is not signed by Apple.