
The Envision TWAIN tests use the twain sample data sources obtained from:

http://sourceforge.net/projects/twain-samples/

On a 64 bit system, install the 

twainds.win64.installer.2.1.3.msi 

package. It will install for both 64 and 32 applications.

On a 32 bit system, install the

twainds.win32.installer.2.1.3.msi

