"Cannot find BookTWAIN" with OpticBook 3600

Problem

When scanning with an Opticbook 3600 using ReadIris on a Mac, you get an error stating that it cannot find the BookTWAIN device.

Cause

This can be caused by a bad driver or installation.

Solution

1. Turn off the scanner.
2. Delete these folders:
• /Library/Application Support/Plustek
• /Applications/Plustek
3. Delete ths folder:
• /Library/Image Capture/TWAIN Data Sources/BookTWAIN.ds
4. Delete all files in this folder:
• /Library/Image Capture/Devices/
5. Empty the Trash.
6. Download and Install our Mac compatible driver for the OpticBook 3600.
7. Turn on the scanner.