From the following page you can download the latest Windows 10 Base Images (.WIM) for use with the Desktop App Converter:
Desktop App Converter is a tool that enables developers to bring their existing desktop apps written for .NET 4.6.1 or Win32 to the Universal Windows Platform. The developers can run their desktop installers through the converter in an unattended (silent) mode and obtain an AppX package that can be installed via the Add-AppXPackage PowerShell cmdlet on their development machine.
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