Update
I need macOS High Sierra 10.14 in order to use Microsoft Office 365 - how can I download this latest link?
Windows, Windows 6
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You might check your sources for system requirements for MS Office 365.
I believe the current version requires macOS Mojave or newer.
How to Upgrade macOS:
The macOS version you can upgrade to depends on the year your Mac was released.
Click the (Apple) menu at the top left of your screen and choose About This Mac.
❗️ – IMPORTANT – Backup your data, now, before you attempt an upgrade.
Learn How to Back up your Mac with Time Machine:
https:/https://www.stclairsoft.com/Go64/
❗️ – IMPORTANT – NONE of your 32-bit apps will work in Catalina or Big Sur.
https://support.apple.com/en-us/HT208436
Before you upgrade, use this free utility to check the compatibility of your apps:
Go64: https://www.stclairsoft.com/Go64/
🖥 – Check the compatibility of your Mac with newer versions of macOS.
https://support.apple.com/en-us/HT201475
✅ - Using Safari only, download the macOS upgrade installer app:
Click > High Sierra, Mojave, Catalina or Big Sur.
Once downloaded, double-click the installer app in the Applications folder to begin the upgrade.