The problem was - if you install the drivers from the samsung page of SCX-3405, or the application (if you don't know Samsung have an easy to use printer installer application) called SamsungPrinterInstaller - it installs all the needed drivers for the printer and scanner, also diagnostics, but still the Easy printer manager CAN NOT LET YOU USE THE SCANNER, even if you manually install the drivers from the download page, cycle of reinstalling scanner driver and failing. Yesterday I tried and for 1 hour going through the Internet, I found it, so I want to share it. As this option isn't available any more, because Windows updates your PC without asking, I gave up on the scanner. When reinstalling the drivers 10 times didn't work, I found a solution to roll back Windows to earlier update, just so I can use my SCX-3405 scanner. Ever since Windows 10 - 64 bit updated to 1803, probably a lot of people had this issue, Easy printer manager giving an error when trying to scan.
One long year I have been waiting to fix the problem with my samsung SCX-3405 scanner problem. I registered to the site here just to answer any man experiencing this problem.
