Install upx on Mac OSX

https://macappstore.org/upx/

Install upx on Mac OSX – Mac App Store

 

About the App

• App name: upx
• App description: Compress/expand executable files
• App website: http://upx.sourceforge.net

Install the App

1. Press Command+Space and type Terminal and press enter/return key.
2. Run in Terminal app:
   ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" 2> /dev/null
   and press enter/return key. If you are prompted to enter your Mac's user password, enter it (when you type it, you wont see it on your screen/terminal.app but it would accept the input; this is to ensure no one can see your password on your screen while you type it. So just type password and press enter, even if you dont see it on your screen). Then wait for the command to finish.
3. Run:
   brew install upx

Done! You can now use upx.