Most software installers on Windows offer the user a "Install for this user"/"Install for all users" option, or will just install to the current user's appdata, which doesn't require admin rights.
Not the case for ImageMagick, there are some things that cannot be installed for current user, like Windows services or specific kinds of shell extensions.
It's definitely not "most". It does happen, but it's actually very rare. Most people nowadays who go to the trouble of making a native installer do so because they want some kind of OS integration, so it's a nonstarter anyway.
pjmlp|2 years ago
tsimionescu|2 years ago