VAIO CPU Fan Diagnostics can be installed only on the models that are listed on the main support website. You should check all the downloads available for your laptop, but if you don't find the software listed, you should use another utility. I recommend you to use SpeedFAN as it gives full control to your CPU fan speed and it provides additional info regarding these devices. Make sure you read all the instructions regarding these applications as it's pretty powerful when it comes to customizing.