Did you try updating to macOS High Sierra? If you did, you might have found a small 19mb online installer named “Install macOS High Sierra.app” inside your /Applications folder. Now I hate the online installers, especially when the real files is around 5GB. If you have a slow internet connection, then it can be frustrating. The final step of this installation process will open App Store.app. Download the macOS High Sierra Beta installer. The download will be surprisingly quick - too quick actually. When the installer runs - quit. Note that the size of /Applications/Install macOS High Sierra Beta.app is only 11MB. Open App Store.app.
I was unable to get High Sierra beta clean installation working ?
My initial intention was to get a external USB drive formatted with an image of High Sierra beta, however, I was unable to do that. I formatted the external drive and the tried to execute this:
It would appear that the beta install application downloaded is not the full one ?
So, instead, I went and installed the beta as is, directly in my system. This worked but this is now what I wanted since it had all the baggage of previous installation.
Then, I restarted my laptop and hit Cmd+R. With the recovery boot of High Sierra Beta, I erased the main mac drive and formatted it to be APFS. Then, I selected reinstalling OSX and after a while, it ended up with error:
So, my system was unusable now, and without an external bootable drive of High Sierra Beta, the only thing I could do is time machine back to my backup :(((
The actual version of the installed seems to be: 17A315f