Windows 11 now lets you create unsigned MSIX packages for "testing". You can install your "legitimate" "application" for "testing" without needing to sign it. Microsoft states this was developed to ma

Create unsigned МУХ package for
testing
Article 01/09/2023
2 minutes to read 5 contributors
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As of Windows 11, you can install your app via PowerShell without needing to sign your package. This
feature is intended to make it easier for you to quickly test your app. Don't use this feature to distribute
your app widely.
Create an unsigned package
An unsigned package must include a special OID (organization 10) value in its element in the
manifest file, otherwise it won't be allowed to register. An unsigned package will never have the same
identity as a package that's signed. That prevents unsigned packages from conflicting with, or spoofing
the identity of, a signed package.
Here's an example.
XML
Copy
ity Name="NumberGuesserManifest"
Publisher="CN=AppModelSamples, OID.2.25.311729368913984317654407730594956997722=1"
Version="1.0.0.0"