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While uninstalling old versions of office is technically not required per communication from Microsoft or even recommended by them, you may want to do so anyway and then reboot before installing new versions to avoid files being carried forward from older versions of Office that may or may not be fully compatible. ECI is not responsible for lost files, contacts, etc.. so please back up all work and configurations you wish to save before doing any install.
Office 365, 2016, 2019, 2021, etc.. all use the same combined installer that can be downloaded directly from Microsoft, but different Serializers and different Config files. Config files are OS dependent and config files from multiple versions may conflict.
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For Macs: Once you login to the above portal and download the Office 2021 zip file, it will unzip into a folder with two packages, both need to be run for Office 2021 to work. Office is registered with a serial number, when opening office for the first time, DO NOT SIGN IN, if you sign in, it will wipe the serial number and attempt to register the software with a Microsoft account. When launching office for the very fist time, just click the small-font option that says "skip" the login. You can then open a new office document. |
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