Canon PowerShot A40 Software Starter Manual page 30

Double-click the drive (usually the [C:\] drive) on which you installed the
software to display all of its folders. Select the appropriate folder
according to the list on the prior page.
If, for example, you have a PowerShot S110/S300 DIGITAL ELPH or
DIGITAL IXUS 300/DIGITAL IXUS v, you would double-click the [Program
Files] folder, followed by the [Canon], [DC USB TWAIN] and [CAMERA2]
folders.
5.
Click the [OK] button once you have selected the last folder.
The window in Step 3 will reappear.
6.
Click the [OK] button.
The TWAIN Driver will install itself automatically.
Double-click the [C:\] drive.
Double-click the [Program Files],
[Canon], [DC USB TWAIN] and
[CAMERA2] folders in succession.
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