To fix the issue - go to line 96 in Create-Win32App.ps1 and change it from:
MinimumSupportedOperatingSystem = $AppData.RequirementRule.MinimumRequiredOperatingSystem
to
MinimumSupportedWindowsRelease = $AppData.RequirementRule.MinimumRequiredOperatingSystem
Currently Create-Win32App.ps1 fails because of a parameter name change in IntuneWin32App in (https://github.com/MSEndpointMgr/IntuneWin32App/blob/master/Public/New-IntuneWin32AppRequirementRule.ps1)
To fix the issue - go to line 96 in Create-Win32App.ps1 and change it from: MinimumSupportedOperatingSystem = $AppData.RequirementRule.MinimumRequiredOperatingSystem to MinimumSupportedWindowsRelease = $AppData.RequirementRule.MinimumRequiredOperatingSystem