This happens every release.  This is why I safe-store installers for every Mac 
OS release on an external drive of my own.  Once you get one installed, the App 
Store will be happy t provide you the upgrades for it, but good luck finding 
the original upgrade installer once Apple releases a subsequent release.

> On Sep 28, 2018, at 10:55 PM, Carl Hoefs <[email protected]> 
> wrote:
> 
> Thanks for the link, but the problem with going that route is that it 
> redirects back to the App Store! 
> 
> On numerous Sierra systems, the App Store shows Mojave as the only upgrade 
> path, even on systems that are not Mojave-capable! And for the mid-2010 Mac 
> Pros, upgrading to Mojave errors out, saying to upgrade first to High Sierra, 
> then to Mojave, but it gives no link to find HS. Catch-22.
> 
> That is the reason I needed to manually locate, download, and apply the High 
> Sierra installer. Surely I'm not alone in this!
> 
> -Carl
> 
> 
>> On Sep 28, 2018, at 10:35 PM, lwpeng <[email protected] 
>> <mailto:[email protected]>> wrote:
>> 
>> 28 September 2018
>> 
>> Hi:
>> 
>> Try going to this Apple support page.
>> 
>> https://support.apple.com/en-us/HT208969 
>> <https://support.apple.com/en-us/HT208969>
>> 
>> 
>> Look at bullet item 4 where they talk about getting High Sierra “if you 
>> still need it”.
>> 
>> This is where I was able to get a copy to re-image a Mac laptop from scratch 
>> (per institutional requirement at my current workplace).
>> 
>> Cheers,
>> 
>> Larry
>> 
>> Caltech grad 1991
>> 
>> 
>>> On Sep 28, 2018, at 12:41 PM, Carl Hoefs <[email protected] 
>>> <mailto:[email protected]>> wrote:
>>> 
>>> I have a 10.12.6 Mac Pro (mid 2010) I'm trying to upgrade to Mojave. The 
>>> Mojave installer tells me to first upgrade to High Sierra, referencing 
>>> Apple doc HT208898. 
>>> 
>>> Where can one download the High Sierra installer? It doesn't show in the 
>>> AppStore, nor online at https://developer.apple.com/download 
>>> <https://developer.apple.com/download>
>>> 
>>> Am I screwed?
>>> -Carl
>>> 
>>> 
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>> 
> 
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