0) open page https://moodle.org/plugins/pluginversions.php?plugin=mod_bigbluebuttonbn 1) download manually and install a plugin from the plugins directory that is of a version that is compatible with yours but that isn't the latest version. (Here i used big blue button but had to set updateminmaturity setting to RC for the next step) 2) got to plugins overview page and test that an update is available for bigbluebutton (to that lastest RC one, can be seen in the download versions tab for the plugin ) 3) continue to upgrade the plugin, test that <moodledata>/mdeploy/mdeploy.log does not report any errors in fetching the zip and upgrading the plugin. your log output should be similar to the following: 2013-05-14 12:32:38 === MDEPLOY EXECUTION START === 2013-05-14 12:32:38 Successfully authorized using the passphrase file 2013-05-14 12:32:38 Plugin upgrade requested 2013-05-14 12:32:38 Downloading package https://download.moodle.org/download.php/direct/addons/2911/mod_bigbluebuttonbn_moodle25_2013050100.zip 2013-05-14 12:32:38 Using custom CA certificate /Users/aparup/Sitesdata/p_data/master/mysql/moodleorgca.crt 2013-05-14 12:32:42 Package downloaded into /Users/aparup/Sitesdata/p_data/master/mysql/mdeploy/var/4971bee4a727f6c31b348a997b06a13c.0.zip 2013-05-14 12:32:42 MD5 checksum ok 2013-05-14 12:32:42 Current plugin code location: /Users/aparup/Sites/p/mod/bigbluebuttonbn 2013-05-14 12:32:42 Moving the current code into archive: /Users/aparup/Sitesdata/p_data/master/mysql/mdeploy/archive/bigbluebuttonbn_1368505962.0 2013-05-14 12:32:42 Package successfully extracted