macOS High Sierra 10.13.5.iso
If you want to create a bootable installer for macOS High Sierra 10.13.5, you'll need a USB drive with at least 8GB of free space. Here's how: macos high sierra 10.13.5.iso
While ISO is overkill for USB, you can burn the ISO to a 16GB USB using (Windows/Linux/macOS) or dd : macOS High Sierra 10
If you must run High Sierra, the final version, , is preferable as it includes all the security updates released during the product's support window. Avoid downloading pre-made ISO files from random websites. They can easily be bundled with malware. The only safe approach is to obtain the official Apple installer (using a Mac, Apple's links, or a trustworthy tool) and then create the ISO file yourself using the terminal instructions provided in this guide. They can easily be bundled with malware