Using v2.8.5 of Moodle on Linux (redhat) server running PHP 5.5.24
Plugins overview page says there is update for HotPot module. Clicking on the install update button gives the error below. Note that even with debugging on and set to display on screen there is no further information.
Oops! It did it again
Moodle deployment utility had a trouble with your request. See the docs page and the debugging information for more details.
exception 'download_file_exception' with message 'Unable to download the package' in mdeploy.php:772
#0 mdeploy.php(1570): worker->execute()