If you are searching for OSX how to install High Sierra and you can’t find it in the apple store, it is because it is not there. It has been removed.
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You’ll have to visit this link: http://updates-http.cdn-apple.com/2019/cert/061-39476-20191023-48f365f4-0015-4c41-9f44-39d3d2aca067/InstallOS.dmg which is referenced from Apple support at: https://support.apple.com/en-au/HT208202 in order to download it and then install it. Annoying yes but no choice.
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It takes about 10 mins, depending on your internet connection to download and then install.
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