Installation Steps:
-  Open Terminal using Spotlight search by pressing  
<command+space>.
Type terminal and hitEnterkey. -  Now, run 
ruby -e “$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)” < /dev/null 2> /dev/null -  Install bloaty using brew
brew install bloaty 
bloaty is ready to use now!