https://support.apple.com/en-us/HT208969, scroll down to part 4 where there is a further link that will take you to the App Store where you can download the OS. This will install the latest/ last version of High Sierra 10.13.6
It sounds like you were trying to install an update to High Sierra, possibly the Combo 10.13.6 from the Apple Support Downloads page, you must have an existing copy of High Sierra to do that as that is termed an update. Going from one OS to another, newer OS is called an upgrade and can only be done through the App Store.
Download macOS High Sierra for Mac & read reviews. Apple brought, but it’s one that sets the stage for new upgrades to come. Even out of that context, it’s a great operating system. Should you download it? Yes, if your device can support it. The new options and better security settings are worth getting. MacOS High Sierra for Mac. This version includes the SDKs for iOS 14, iPadOS 14, macOS Catalina, tvOS 14, and watchOS 7. Download from the Mac App Store. Global Nav Open Menu Global Nav Close Menu; Apple; Shopping Bag +. Download MacOS High Sierra DMG Without App Store. If you looking on the internet a MacOS High Sierra DMG So, you come to the right place now a day shares with you a Mac OS High Sierra 10.13.6 direct download without an app store. Mac OS operating system it’s too much popular in the world for security vise and a lot of cool features, Apple Upgrade the operating system Sierra to High Sierra 10.