Custom Script Extension Download Path for Script Files C:\Packages\Plugins\Microsoft.Compute.CustomScriptExtension\1.10.3\Downloads\0 Log File Path C:\WindowsAzure\Logs\Plugins\Microsoft.Compute.CustomScriptExtension\1.10.3 Test with PowerShell $setAzVMCustomScriptExtensionSplat = @{ VMName = 'academy001' Name = 'DemoScriptExtension' FileUri = 'https://foo.blob.core.windows.net/deploy/lab_vm_postInstall.ps1' Location = 'West Europe' Run = 'powershell -ExecutionPolicy Bypass -File lab_vm_postinstall.ps1 storage20200102224911' ResourceGroupName = $rgName } Set-AzVMCustomScriptExtension @setAzVMCustomScriptExtensionSplat