It's really not hard to do your own thing and then you have freedom to modify how it works. I use an HTTP get to the server to fetch the latest version, alert the user, if they select update I run an external app that pulls the installer down and ...
When a user runs our software, we notify them of their version and the current version available. If they want the update, they have to come to the web site and download it manually.
I use to work on desktop app that have about 500k - 1M active users each day. We have build our own update system, each app checks if there is new version daily and then download it and install update automatically.
To prevent cases that wrong up...