Run the (TWAIN/WIA component). Reboot your computer.

The results were a digital wasteland. The official Samsung support page redirected him to a generic HP portal (HP had acquired Samsung's printer division years ago). The page listed drivers for the SCX-4521F, but they were just basic print drivers. They didn't include the SmartThru 4 office suite he needed for the one-touch scanning workflow he relied on.

Virtual USB ports fail to recognize the legacy Samsung hardware interface. Step 1: Download the Correct SmarThru 4 & Driver Packages

You need two specific downloads. Since Samsung's support pages have migrated to HP, look for these drivers specifically:

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