Report Xampp in PHP for the Web: Visual QuickStart Guide (5th Edition) Posted October 27, 2017 oops. Sorry. I'm using a MacBook Pro running OSX High Sierra. I'm not exactly sure where I installed it but it must have just been the default location... my hard drive? Unrelated topic but pertinent: Around the time I installed it my computer has been freezing, and shutting down completely (kernel panic) after putting it to sleep for weeks now. Finally it is working again, but after days of troubleshooting, I'm now really nervous about installing any sort of MAMP or XAMPP software. Is it possible this software has not been approved to work with High Sierra at this point?