UPX detail : Compress/expand executable files;
Open terminal | Command+Space and type Terminal and press enter/return key.
Paste following code :
ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" < /dev/null 2> /dev/null
Wait for the command to finish. After completion run following code :
brew install upx
Well it didn't work with "brew install upx"
I did also get the message:
You can try to install from source with:
brew install --build-from-source upx
So that's what I did, I put in the terminal "brew install --build-from-source upx" and it works
Thanx for guiding me