Updating php windows
You may need to run the command as if you don't have full write permissions to the wiki install directories under your current user.
Extensions that are not adapted should use the old way of installing them. New variables may be added in newer versions, or some existing variables changed their type.
Extension Distributor works well for most people who want a snapshot of extensions that will work with their supported versions of Media Wiki.
If you want a lot of extensions then downloading from Git is probably best.
From the command line or the Shell, change to the ): First make sure that your web server (such as Apache) and your database (such as My SQL) are running.
Then run update.php: right-click it, select Open With, and browse to If you instead extract the new version directly on top of your old version, rather than in a new directory, you should follow the instructions described in Back up existing files and the database: otherwise, if you've made any customizations you may erase them in a way that leaves you with no reference to re-apply them from.