The MODI is a component of Sharepoint Designer 2007. You can directly download it from the following url and install directly with administrative privileges.
During the installation, make sure you enable "Microsoft Office Document Imaging" as show below.
Click on the expand icon (+) next to ‘Microsoft Office Document Imaging’.
Right click on Scanning, OCR and Indexing service filter and click on 'run from my computer'.
Click on continue and then restart computer.