When you’re done installing: just click the “Eject” arrow.And you’re done: the Calculator+ is now installed.Simply drag the application’s icon to your Applications folder.Often these will include the application itself, some form of arrow, and a shortcut to the Applications folder.Double-click the DMG file to open it, and you’ll see a Finder window.dmg installation file from the official link on above Like if you wanna download Calculator+ for mac from this page, you’ll directly get the. Most Mac OS applications downloaded from outside the App Store come inside a DMG file. It supports trigs, stats, combinatorics, and algebraic functions, multiple memories, simple RPN operations, and simultaneous base conversion in base 2,8,10,16. Calculator+ is a lightweight scientific calculator for Mac OS X written in Cocoa Java.