Need Clarification to change My Load runner version from 11.5 to 9.2

Hi,

I need, Some clarification in the Load runner. I already installed load runner 11.5 trail version. This is expired two days before. I can't get a license key also. Can, I change the Version from load runner 11.5 to Load Runner 9.2.

Can I change this version in My system?

If yes, How can I change and Install?

My system Configuration

OS - Windows XP

I have a admin privilege also.

Thanks and Regards,

Arun