I installed Office 2016 from an MSI installer, but the updates apparently still happen via a Click-to-Run process. Susan Bradley has a nice tip here on changing from monthly to semi-annual updates (which should be more stable but still get security updates). This Microsoft blog post has a bit more detail. Before the update, in
Microsoft 365: Switch to monthly app updates for May 2022 planned – Born's Tech and Windows World
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Microsoft 365: Switch to monthly app updates for May 2022 planned – Born's Tech and Windows World