Updater link in admin does not work properly

I’ve just purchased Aff Ent (this is my second copy, we use it on another site and think it’s great), and I’m trying to get the Updater installed onto the site. I get the same error message this guy did (https://www.itthinx.com/topic/itthinx-updates-plugin-link-does-not-work/) – and there is nothing wrong with my site configuration. I went to the repo to search for the updater plugin, figuring I would just download it directly from there (after all why wouldn’t it be there) and it’s not there…

Do you have a zip file for the updater plugin? Can you publish a link to it please?