I keep getting a strange error screen when I try to click on/install the USPS or UPS modules in the shipping area in admin. Error reads:
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Forbidden
You don't have permission to access /admin/modules.php on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.
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Any ideas? I have consulted a few other Zen people and they have sent me here. Permission is set to 644 - but I think it is supposed to be that way. Have tried to reinstall the php files via FTP, but it still doesn't ever show the "install" button.. . just gives that error. (Running Zen Cart 1.3.6)

Thanks in advance.