Pololu wheel encoder library

Hi all,
I recently bought this wheel encoder for my project.

Can anyone give me the link from where I can download the library so that I can use it with my Arduino Mega?
I have read some example codes and I hope I can get it to work.

Thank you.

Everything is on the Pololu site, linked from the product page.
If you have questions, post them on the Pololu forum. The engineers are extremely helpful and responsive.