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MacHeadCase
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You should always use the installer. Right now, you have seen or heard about apps that use .dmg files for the install but others come with their own installers and that makes for more files being installed here and there, some of them hidden.

Another point in favour of using the initial installer is this: say you haven't used a certain app in a while but want to copy it over your other Mac and that app is now a bit wonky or corrupted but you don't know it. You'll be transferring that instability over to another computer. If you use the installer, you get a fresh new app on the other Mac.
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