This will install the software providing a username, organization, email and key for registration. There doesn't seem to be a way to disable setting PDF-XChange Lite as the default printer unfortunately. This will also disable the updater they package with their software and remove the desktop items.
PDFXVE7.exe /install /quiet /norestart /log 'C:\logs\PDFXE.log' USERNAME='Username' ORGANIZATION='Company Name' USERMAILemail@example.com' DESKTOP_SHORTCUTS=0 NOUPDATER=1 KEYFILE="Personal.xcvault"
Setup Type: Windows Installer (Delivered as an EXE)
Deployment Method Used: Vendor Provided Command Line (switch driven)