I hope it saves you some time.
After dealing for more than two hours unsuccessfully trying all the fixes that I could find in the following help links, I decided to scrap the idea of getting the Canon MF Toolbox to work with Windows 10 (Version 4.9.1.1.mf18 for Windows).
As a workaround, I installed NAPS2 (Not Another PDF Scanner 2).
With NAPS2, I am able to load my documents in the scanner and select "Scan" then "Remote Scanner" on the scanner menu. From there, NAPS2 is able to communicate to the scanner and pull in my documents as PDF (or other formats as needed).
NAPS2 is available here: https://www.naps2.com/
Below are details of the issues that I had with the Canon MF Toolbox and some of the fixes that I tried.
Primary issue:
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ScanGear MF Cannot communicate with the scanner. The cable may be disconnected, or the scanner may be turned off. Check the scanner status and try again. Scanner driver will be terminated.
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Fixes tried:
MF Toolbox doesn't work on Windows 10
The solutions in the following link did not work for me.
http://community.usa.canon.com/t5/Office-Printers/MF-Toolbox-doesn-t-work-on-Windows-10/td-p/147893
Windows 10 - Canon Scanner unable to scan error- cannot communicate with scanner for these reasons: scanner is turned off (it is not), USB cable is disconnected (it is not)
The solutions in the following link did not work for me.
https://answers.microsoft.com/en-us/windows/forum/windows_10-hardware/windows-10-canon-scanner-unable-to-scan-error/db3008d1-b4b7-4151-ae14-53609fa80357?page=3
Error on Computer "MF Toolbox that you are using may not be installed on your computer. Install the appropriate MF Toolbox and perform operation again."
The solution in the following link did not work for me.
https://support.usa.canon.com/kb/index?page=content&id=ART117476
These are the drivers and the patch that I couldn't get to work. Note: Printing works with these drivers. I just couldn't get the scanner to work with the Canon MF Toolbox.
[Windows 64bit] imageCLASS MF4570dn MFDrivers (UFR II / FAX / ScanGear) 10/21/16 File name MF4570dnMFDriversV2031W64usEN.exe
Canon said: "If you cannot scan over a network or with a USB connection in Windows 10/Windows 8.1/Windows 8, install the MF driver, restart (not shut down) your PC, and then install the following program."
[Windows 64-bit] Patch for Network Scan, USB Scan (Windows 8/8.1/10) 10/21/16 File name MF4500USBScanPatchW64EN.exe
Canon said: "This patch resolves an issue that prevents scanning over a network or with a USB connection after upgrading Windows to a newer version. If you cannot scan over a network or with a USB connection, install this patch. If installing (or reinstalling) the MF driver, be sure to first restart (not shut down) your PC after driver installation is complete, and then install this patch."
This patch did not work for me.
Workaround:
These are the links that led me to the NAPS2 solution...
Solved Windows Fax & Scan: How to Scan Documents to PDF format
https://www.tenforums.com/software-apps/27481-windows-fax-scan-how-scan-documents-pdf-format.html
wikiHow to Scan Documents Into PDF
http://www.wikihow.com/Scan-Documents-Into-PDF
Again, I hope this saved you some time.
Time is highly valuable. Click HERE to see exactly what I mean.
