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Windows Insider Updates will not download
Your device is now seeing Beta builds, but each upgrade completes the restart phase and then rolls back. The useful next step is to identify the rollback cause instead of repeatedly retrying. Open Settings > Windows Update > Update history and record the failed build and error code. Run Microsoft SetupDiag as administrator, then inspect %WinDir%\Logs\SetupDiag\SetupDiagResults.xml; when it reports several failures, the final one is normally fatal. Before another attempt, ensure adequate free space, disconnect nonessential USB devices, temporarily remove third-party antivirus or VPN software, install current firmware and storage or graphics drivers, and perform a clean boot. Then run DISM /Online /Cleanup-Image /RestoreHealth followed by sfc /scannow and retry. Because 22635.5015 is very old, the normal servicing path may no longer bridge cleanly. If SetupDiag confirms that, back up your data and use an official current Insider ISO for an in-place upgrade, or clean-install the intended channel.