can't see Macbook os update
I'm stuck on MacBook OS Sierra and trying to update to High Sierra but can not see it in the App Store. I'm on a MacBook air 2017
MacBook Air 13″, macOS 10.12
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Do not use Firefox for this link...
https://itunes.apple.com/app/macos-high-sierra/id1246284741?mt=12
If you get a corrupted message...
Naw, not damaged, it's just that you have an old copy already in Applications, there are 2 cures...
Disconnect from the Internet & set the Date back to 2014, then you can run the Install MacsOS High Sierra App in Applications, so expired Certificates are not expired.
Or... trash the Install MacsOS High Sierra.app in Applications then a new copy more recent version can be downloaded.