Fix FwLite auto-update by rolling back AppInstaller namespace to 2018

[hahn-kev-bot]

running Get-AppxPackageAutoUpdateSettings -PackageFamilyName FwLiteDesktop_01zkby2q2skmg on my machine said that automatic background updates were not enabled when using the app installer with a root namespace 2021. Changing it to 2018 fixed that. I'm still waiting to see when windows actually runs an update check, but it does say it will check every 24 hrs now.

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AI summary

The generated .appinstaller file declared its root namespace as http://schemas.microsoft.com/appx/appinstaller/2021. Per Microsoft's AppInstaller schema reference, the root namespace version dictates the minimum OS required to parse the file at all — the 2021 namespace requires Windows 11 21H2 (build 22000). On Windows 10 and older Windows 11 builds, the App Installer can't parse the file, so the update check silently fails and auto-update never happens.

The only UpdateSettings elements we use — AutomaticBackgroundTask (min Windows 10 1803) and ForceUpdateFromAnyVersion (min 1903) per the update settings docs — long predate 2021 and are valid unprefixed under the 2018 namespace (matching Microsoft's own documented examples). Rolling the root namespace back to 2018 restores compatibility down to Windows 10 1803 while keeping every element we rely on.

Change is a single-line namespace swap in FwLiteReleaseService.GenerateAppInstaller. No test asserted the namespace string; the one test that parses the generated XML only reads the root Uri attribute and is unaffected.

Note: only FwLite testers are on this update track today, so no broad-fleet impact. Installs already pinned to the 2021-namespace file recover once an App Installer that can parse the corrected file fetches it; any truly stuck may need a manual reinstall.

Test plan

• Existing FwLiteReleaseServiceTests still pass (XML parse + Uri assertion unaffected)
• Verify a Windows 10 install successfully picks up an update via the regenerated .appinstaller

[coderabbitai]

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