Clear-ApplockerLocalPolicy.ps1

#Requires -Module Applocker
#Requires -PSEdition Desktop
#Requires -RunAsAdministrator

Function Clear-ApplockerLocalPolicy {
[CmdletBinding()]
Param()
Begin {}
Process {
    Try {
        $null = Get-AppLockerPolicy -Local -ErrorAction SilentlyContinue
        [Microsoft.Security.ApplicationId.PolicyManagement.PolicyModel.AppLockerPolicy]::FromXml(
            @'
<AppLockerPolicy Version="1">
  <RuleCollection Type="Exe" EnforcementMode="NotConfigured" />
  <RuleCollection Type="Msi" EnforcementMode="NotConfigured" />
  <RuleCollection Type="Script" EnforcementMode="NotConfigured" />
  <RuleCollection Type="Dll" EnforcementMode="NotConfigured" />
  <RuleCollection Type="Appx" EnforcementMode="NotConfigured" />
</AppLockerPolicy>
'@
        ) | 
        Set-AppLockerPolicy -ErrorAction Stop
        Write-Verbose -Message 'Successfully cleared local Applocker policy'
     } catch {
        Write-Error $_
    }
}
End {}
}