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Why do newly-installed programs always appear with external drives in Finder on my MacBook?

For example, I just installed Zotero and no problem opening it but I see it listed under my external USB in finder with the little eject icon on the side. I’m afraid if I push eject I’ll delete the program and lose my work.

Why do the newly-installed programs appear there?

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    To clarify, what you’re seeing is not the installed program. It’s the virtual disk image from which you install the program by copying it to your Applications folder. – Konrad Rudolph May 13 at 10:12
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When you download an application, it often comes inside a "Disk image" (a .dmg file). This is a virtual volume, which appears just like other disks on your Desktop, once you've launched it.

You have to copy the application from there into your /Applications folder. (Disk images often contain an alias to your Applications folder, so you can easily drop the app onto the folder.
Or, if the image contains an installer app or package, you have to run the installer app.

Once you have done this, you can eject the disk image and trash the .dmg file. If you haven't copied the app or installed it, then you need to make sure this is done first.

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    Only just realized how old fashioned of an experience that actually is: You take a CD, mount it in a drive, and install the application from that drive. – David Mulder May 13 at 10:50
  • It is so old-fashioned that this is one of the places where you'll see vestiges of the NextStep OS in modern Macs. There's a funny-looking X symbol in the window there somewhere, and it's a bit of NextStep UI in Mac. – the0ther May 13 at 17:05

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