Installing Balsamiq for Desktop on macOS
Point your browser to the download page and download the latest version of the app to your hard drive. This will save a .dmg file to your computer. Find where the .dmg file is saved, double click it, and then drag the smiley face into the Application folder.
It's that easy. Find the app in your Application Folder and launch it.
Note: Advanced installation instructions can be found on this page.