If you are using a MacOS operating system and want to upgrade/update this new version, you can download and install the macOS High Sierra 10.13.5 update from the Apple Store. However, if you do not know how to update the macOS operating system, you can check out How to Upgrade macOS High Sierra.
You are Welcome! The Mac Tutorial Shows You Step-by-Step and Visually How-to Install Oracle VirtualBox App on Mac OS X 10.13 High Sierra Desktop. And VirtualBox for Mac 10.13 is a Free and powerful PC virtualization solution allowing you to run a wide range of PC operating systems on your computer. This includes Windows, Linux, FreeBSD, DOS, OpenBSD and others. Finally, VirtualBox comes with a broad feature set and excellent performance, making it the premier virtualization software solution on the market.