If you're looking to save or export your scanned images in SilverFast, here's a simplified breakdown:
Once you perform a final scan, your image is instantly saved to a specified location on your computer. You don't need to search for an additional 'Save' button.
In the PDF Maker tool, pressing "scan" only adds the page to a preview. To save your PDF, use the dedicated "save" button found within the PDF Maker.