@Camilynn-
Some have reported they've been able to get the update to complete by temporarily connecting to a different network, usually a wifi hotspot on their phone. After the update completes and the tv is set back up you can switch back to your normal network.
Roku Community Streaming Expert
I am not a Roku employee, only a user like you. Please, no support questions via private message -- post them publicly to the Community where others may benefit as well.
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Ultra 4800 | Streaming Stick 4K+ 3821 | TCL Roku TV 43S245/C107X