Sorry for the delay.
I imagine that you found out the answer after all, but just in case...
You need to download a specific TWAIN driver in order to use PaperScan, that you can find for free on your device's brand's website.
Don't forget to plug out your device during the process.
I invite you to have a look at these further information by checking our TWAIN acquisition issues topic.
Please let me know if you have questions.
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