I'm programming a VSTO add-in I would like to make "update-able" from the server where I publish.
Does ClickOnce permits that type of deployment or do I need to do it by myself?
This was possible using dropbox but not anymore :
I need people's opinion on how to update a ClickOnce application through FTP
Yes, ClickOnce can do what you are describing. You just need to choose a ClickOnce strategy and the update intervals, refer to the documentation.