1. In your config.php, declare $CFG->skiplangupgrade = true; 2. Go to your moodledata directory 3. Remove the lang directory if it is present 4. Fetch the lang directory from the Git repository. Make sure that the web server process can read the files there. git clone git://github.com/amosbot/moodle-langpacks.git lang cd lang git checkout -b MOODLE_22_STABLE origin/MOODLE_22_STABLE 5. Visit Site administration > Language > Language packs 6. TEST: Make sure you can't update lang packs via web now 7. TEST: Make sure you can purge caches via a button there 8. TEST: Make sure you can purge caches by executing admin/cli/purge_caches.php Hint: there are several ways how to check if the caches are purged. For example, the file moodledata/cache/languages should be removed each time you purge the cache and recreated each time you reload a page (unless you have $CFG->langcache set to 0).