How do I set Download Manager so it doesn't use mobile data? LG V20, T-Mobile


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Jan 24, 2017
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T-Mobile sent a Android System Update to me last night. The update size was 583 MB, or more than a quarter of my monthly mobile data plan. Very annoying!
How do I set the Download Manager so it only does downloads when I am connected to Wi-Fi?
I have already set various apps to not sync or do background processes using mobile data. I cannot find how to prevent system updates from eating up my meager data allowance.