Older TWAIN drivers were often unsigned or used deprecated certificates. Windows 10’s strict driver signature enforcement (especially after the 2016 Anniversary Update) began blocking these drivers from loading, rendering otherwise functional scanners into paperweights.
: Double-click the downloaded file and follow the on-screen prompts. You may need to restart your PC to finalize the installation. HP Support Community Troubleshooting "TWAIN Driver Not Found" twain driver windows 10
Search for your model and select "Windows 10" as your operating system. Look for a download labeled "TWAIN Driver," "Full Driver & Software Package," or "Scan Driver" . Older TWAIN drivers were often unsigned or used
The troubleshooting rabbit hole is deep and dark: " "Full Driver & Software Package