Unblock all blocked apps:
[string]$regKeyAppExecution = 'HKLM:SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options'
[psobject[]]$unblockProcessName = Get-ChildItem -Path $regKeyAppExecution -Recurse -ErrorAction 'SilentlyContinue' | ForEach-Object { Get-ItemProperty -LiteralPath $_.PSPath } | Where-Object { $_.Debugger -like '*AppDeployToolkit_BlockAppExecutionMessage*' }
ForEach ($unblockProcess in $unblockProcessName) {
$unblockProcess | Remove-ItemProperty -Name Debugger -ErrorAction 'SilentlyContinue'
}