A newer software version is available: CleanMyMac X.
Download CleanMyMac X free edition here https://bit.ly/2Ti1RSr
A step-by-step guide to make the “Startup Disk is Almost Full” error go away. Find out how to quickly clean up your hard drive and free up disk space. You can easily clean up your Mac and get more space for your files by finding all the folders and libraries on Mac you need to clean. Get handy apps to help you on the way, like CleanMyMac X.
Get rid of junk and uninstall apps on Mac completely, leaving no old pieces behind. Get rid of localization files as well. Lots of apps come in multiple languages, but you only use one or two. This means the files of those other languages are wasting space on your disk for no good reason. You should find and remove them, as well as outdated iOS backups and software updates.
Don’t forget to empty Trashes after you’re done. Happy startup disk cleaning!
Here’s a article guide on fixing full startup disk: https://bit.ly/2T4cSbn