The National Instruments OCR Training Interface is provided as part of the NI LabVIEW Vision Development Module (VDM), listed on the NI download page under Image Processing Module. It is available from NI for purchase or evaluation. Although a license is required to run parts of the VDM, the license is not necessary to run the OCR Training Interface utility.
NI VDM Installer
Install the VDM core components (the first option in installation wizard). To run the utility, select National Instruments->Vision->Utilities->OCR Training from the Windows main menu.