To get the msi installer for usb twain driver, you must perform the following operations:
Download the Lexmark Printer Software G3 Driver and Software Installer.
Launch the Installer > Select as Installation Type: Extract Package option.
Remove the check of the Launch the software after extraction completes option then click Start.
Go to "C:\Lexmark\InstallationPackage\Drivers" folder location > Depending on OS architecture.
There is an msi installer (for example: Scan64.msi).
Use this msi package for silent installation of USB Twain driver.
If the issue persists, search for more information related to this issue or contact support for further assistance.