This is for the offline scratch installer.
1 download installer http://scratch.mit.edu/scratch2download/
2 They say you need to install adobe air. So install that first.
3 Then deploy scratch with these command options for a silent install "Scratch-432.exe -silent -eulaAccepted -desktopShortcut -programMenu -allowDownload"
Setup Type: Windows Installer (Delivered as an EXE)
Deployment Method Used: Vendor Provided Command Line (switch driven)