Gotten more stuff working after 1903 killed .net.
Installed .NET 5.0 beta which doesn’t require hoops to be jumped through to install on Win1.0. That might have allowed the Windows Storefront app to work again (or there was something else I did at the same time that I have forgotten), and I was able to “update” the base apps that came with win… .
Several apps still failed, like windows photo, paint 3d, calculator, etc…
Looking into the event viewer under the ‘extras’ a.k.a. applications & services logs, there are some logs that contain extra info:

Here I could for example see:
Failed with 2147942402 to retrieve the trust state of the package Microsoft.VCLibs.140.00.UWPDesktop_14.0.27810.0_x64__8wekyb3d8bbwe folder.
The last message is kinda interesting, when checking the WinApps folder, I noticed that several of the folders mentioned were missing.
Copying them from another Win10 installation I have, I could now get Kali Linux and Photo3D to work.
However, Caltulator still fails with this message:
Activation for Microsoft.WindowsCalculator_8wekyb3d8bbwe!App failed. Error code: Unknown HResult Error code: 0x80040904. Activation phase: COM App activation
So — Getting closer, and still haven’t been forced to do a full reinstall.
Didn’t really bother troubleshooting this further after the initial ‘hacking in .NET’ as that solved the immediate issue of windows update, troubleshooters and powershell not loading.
I guess the key takeaway is that the “basic” 4 event logs do not give you the full information to troubleshoot appx problems, and you have to look into the list of 100s to find some event logs that might contain the necessary information, and not all of them are ‘enabled’ for logging either.
I think the problem I have currently with some of the apps is problems with Microsoft.UI.XAML and some VCLibs so guess I’ll have a stab at those.
Think I found a way to find some of the stuff that is missing althought I doubt I’ll be “fixing” advertising.
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@Woolen_Horde WDDM 2.7 sounds interesting if it has an actual real world performance increase? Wonder if toms or anyone have done tests already.
Knowing MS though I think I’ll wait a few months before going for 2004. Still haven’t been offered 1909 either so might as well wait until the guinea pigs have had all the files deleted and system crashes necessary to make it a stable MS post-win7 product.