In the case of Tuxera NTFS for Mac, our kernel extension expands the capability of your Mac to write, delete, and move files on Windows NTFS-formatted drives. A 'kernel extension' is code that would help expand the kernel's capabilities. The kernel has complete control over everything inside the Mac. In plain English, the kernel is a program running at the core of macOS. The NTFS for Mac 2018 installer now easily guides you through this process. With the launch of High Sierra, Apple introduced a requirement that users must manually approve any software that loads new kernel extensions. In an earlier post, we discussed an issue with High Sierra blocking the 2016 release of Tuxera NTFS for Mac. If you're running High Sierra, you'll definitely want to upgrade to the latest version of Tuxera NTFS for Mac.