Try opening a ticket at https://partnersuccess.roku.com/hc/en-us . When users report something like this in the support forum they're told to uninstall and reinstall, but that's not really a solution since most owners don't even know about the forum.
It shouldn't matter, but what's the minimum OS version you set? 11.0 is in the middle of rolling out, so if you set that as the minimum version users that still have 10.5 won't be able to get the update, but they should keep the previous version of your channel.
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