This is an ideal use case for the Qlik-Cli-Windows PowerShell library (check the wiki for some guidance on getting things set up). This script isn't productionalized but works and shows the concept:
$basePath = 'C:\tmp\exporter'
# Navigate to the path where you want the QVFs
Set-Location $basePath
# Connect to Qlik
Connect-Qlik
# Get all apps in a specified stream and export them
Get-QlikApp -filter "stream.name eq 'Monitoring Apps'" | foreach {Export-QlikApp -id $_.id -filename "$($_.name).qvf"}
# Compress all the QVF files in your export path to a ZIP
# Adapted from https://docs.microsoft.com/en-us/powershell/module/microsoft.powershell.archive/compress-archive?view=powershell-5.1
$compress = @{
Path = "$($basePath)\*.qvf"
CompressionLevel = "Fastest"
DestinationPath = "$($basePath)\apps.Zip"
}
Compress-Archive @compress
