After downloading the patch, you can apply it. The processes for applying the patch are different for Talend Studio/Talend CommandLine patches and other types of patch (such as ESB patches).
All Talend Studio clients connected to the same project must install the same patch. Updating a Studio connected to a project requires all the Studios connected to that project to be updated.
Before applying a patch, be sure to create a backup tag or a backup branch with the current Talend version.