To have a better understanding of your issue, please let everyone know the operating system on your computer, and also please confirm your printer model, as what you provided is the series but not model number.
If this is a time-sensitive matter, please check out your other support options here: https://canon.us/account
To use twain with the MF4150, you can download and install the imageCLASS MF4150 MFDrivers (UFR II / FAX / ScanGear) driver from our support site. It will install the printer driver and twain scanner driver. Once the drivers have been installed, you can download and install the Tool Box Ver.188.8.131.52.from our support site. The toolbox will be the scanner software designed to work with the twain driver. You can check the features of the tool box and how to use them using the link HERE.
07/31/2023: New firmware updates are available.
05/31/2023: New firmware updates are available.
05/18/2023: New firmware updates are available.
04/20/2023: New firmware version 1.4.1 is available for EOS R3
03/30/2023: New firmware updates are available.
2/07/2023: New product announcements!EOS R8 EOS R50RF-S55-210mm F5-7.1 IS STMRF24-50mm F4.5-6.3 IS STMRF15-30mm F4.5-6.3 IS STM