How to update WPMU Dev plugins

I have several WPMU Dev plugins (Post Indexer is just one of the many) that have updates. When I go to update them, they are not automatic updates like other plugins, it makes me download them. I have not been able to find any support articles or help on what to do from there. How do I update these plugins. Do I just go to plugins-->Add New--> and import them again from there? I don't know where to start. Please help. Thanks!