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Why does every app need its own auto-updater instead of using the OS?

Does windows provide an updater for apps..? I bet they don't on XP or 7, which are still highly used.

Also, I bet it's far easier to write an auto-updater than it is to figure out each OS's update method (building a deb,rpm,etc)

> I bet it's far easier to write an auto-updater than it is to figure out each OS's update method (building a deb,rpm,etc)

Write some POS 'blindly overwrite files, no you can't downgrade, what do you mean "changelog"' updater?

Sure, I bet you can do.

Write something that handles user preferences, changed config files, conflicts etc as well as apt/dpkg? I doubt it.

You don't have to, there's tools that do it for you.