This copy of the Install OS X Mavericks application can’t be verified. It may have been corrupted or tampered with during downloading.

After following the instructions on creating install media for Mac OS X Mavericks, I repeatedly got the error message “This copy of the Install OS X Mavericks application can’t be verified. It may have been corrupted or tampered with during downloading.” After some web searching, I came across Jonathan Mohar‘s blog with the bit that did the trick! You simply have to set the date on your computer before you attempt the installation.

  1. From Utilities menu, pick Terminal
  2. Set the date using the command: date 110216472013.53
  3. (Optional) You can get an actual current date from another machine in the Terminal with the command: date “+%m%d%H%M%Y.%S”
  4. Then type exit to exit the terminal, or command-Q. The installer comes back up, and all is well.

Thanks, Jonathan! =)

UPDATE: Try a more current date, like 072415382014.20 – this may work better than the one in the post above, at this point. Best to get a fresh one using that command, if you can.