you for reaching out on the community and telling us about your issue. I do apologize for the issue you're having. When you go across the top to tools > scheduled updates what does yours look like? Generally to turn it off you'll want to uncheckmark all of the accounts. Once that's done you can hit ok and it should turn them all off so you aren't prompted for the scheduled update anymore. I'll leave a photo down below.
let us know if this helps resolve the issue for you.
I have the same issue. After turning off everything, I get the message that I must indicate a schedule date and the problem continues.
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