Troubleshooting an Oops FileNotFoundException Error when downloading a file
After applying the WHMCS 7.7 update, you may encounter an Oops error message when attempting to download a file:
exception 'League\Flysystem\FileNotFoundException' with message 'File not found at path: filename.zip' in /path/to/whmcs/vendor/league/flysystem/src/Filesystem.php:388
This error occurs when the file in question does not exist on the server in the /downloads directory.
The file that cannot be found is listed in the error message.
Upload the file to your server.
The file should be present in the Downloads storage location as defined on Setup > Storage Settings
For more information on Storage Settings refer to the documentation: http://docs.whmcs.com/Storage_Settings