The minimal requirements for ImageManager are;
You may install ImageManager the same way you install other Joomla! extensions on your Joomla!-powered websites. Simply download ImageManager. You'll receive a zip-package named pkg_imagemanager-<version>.zip.
Updating ImageManager is simple! Simply install the newer version of ImageManager using the instructions above or use the Joomla! updater to install the latest version.
If you need to uninstall ImageManager, for example, to start over or to reinstall, you can follow the instructions below to do so.