Something that makes no sense has worked for some users. Try switching the Internet connection to something different, such as a smartphone hotspot. Let the update complete, then switch it back to the home network.
If it's not giving you the ability to switch the connection, a full System Reset puts you back in the initial setup, and you can choose the Internet connection at that time. The annoyance with that is you have to authenticate all the necessary channels again.
Dan
Roku Community Streaming Expert
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