The best thing is to get the Download from our link at the top for Zen Cart v1.3.7 ...
Then add in the latest PayPal Patch at:
http://www.zen-cart.com/forum/showthread.php?t=56216
Then add the update for the USPS shipping module for the May 14th server changes and price changes on USPS at:
http://www.zen-cart.com/forum/showthread.php?t=65732



