mac os sierra
how to upgrade the software, mac os sierra 10.12,6 to 10.13. I have 21.5 inch 2011
iMac 21.5", macOS 10.12
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When I follow your link and get to App Store to download the 10.13 High Sierra installer I get this message (see attached)? What to do next?
Toss it into the Trash and redownload. Be sure you have a fast and reliable Internet connection. If you have Ethernet, then use it rather that Wi-Fi.
mac os sierra