A company called (originally a hardware company that pivoted to software) developed VRS. It wasn't just software; it was marketed as "hardware inside the scanner." It sat between the physical scanner and the computer, intercepting the image in real-time. It could look at a document, realize it was too dark, and tell the scanner to rescan it brighter—automatically. It was revolutionary. It turned terrible scans into perfect PDFs without human intervention.
Assuming you have obtained a clean installer (e.g., VRS5.1_Setup.exe ), follow this procedure: kofax vrs 5.1 download