The latest version of Shree-Lipi is 7.4. I believe you're having problems because version 6.0 is not compatible with Windows 8, therefore I would let it go and download the latest one instead.
The latest version supports 64bit computing as well. However, there is a problem. You have to be a customer to download the latest versions because I see it's commercial. Access the official website to learn more about it and eventually get in touch with the developers to allow you to download version 7.4.
Here are the support details available:
Call 91-20-24226612 or Email email@example.com