https://www.mspaforums.com/showthread.php?43922-PESTERCHUM-3.41-Updated-Pesterchum!-New-Thread
If you go down to your respective area, you'll find the download link-- like, if you have a Windows and are new, go to: IF YOU ARE A NEW PESTERCHUM USER OR ARE INSTALLING ON A NEW COMPUTER:
If you have a Mac, it works there too-- go to: IF YOU ARE ON A MAC:
IT'S SO AWESOME-- and it works o3o. . . NOW I NEED YOU, MY PESTERCHUM BUDDIES--
---EDIT---
I have gotten a few questions about if it is safe to use or if it installs viruses, and as far as I am away, it doesn't.
And as for if it's not working, it is likely an issue with the computer itself,