iPhoto 9.2.3 upgrade to iPhoto 9.4.3
When I try to download and install the update for iPhoto 9.2.3 to iPhoto 9.4.3 it will only progress to about 553mb of the 768.3mb download and then get error message that indicates, [The update "iPhoto Update" can't be installed. The update could not be verified. It may have been corrupted or tampered with during downloading. The update will be downloaded and checked again the next time that Software Update runs.] Running OS X Lion 10.7.5. Have attempted to download multiple time with same result. Any alternate way of update to 9.4.3?