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You should upgrade or use an alternative browser. Moved to the 15.2 final release. Apple Intelligence won't finish setting up. It claims to be at "100%" but never actually transitions out of the downloading state in Settings. I can't find any similar reports of this behavior. I see in earlier betas, people were fully clearing "/System/Library/AssetsV2/" -- I did this, and although it allows the data to be rebuilt, it still fails. In my case, within "/System/Library/AssetsV2/", the "DownloadDir" and "Staging" seem to be repeatedly trying to download the same 10-20MB files repeatedly even after 24 hours. I'm connected to both power and WiFi as it asks me to. Any ideas?

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