This should be easy actually...
Download from
here. Make sure you choose the correct OS and Bit-version. The AURA-Software can be found in the "Utilities"-category.
After that you should be able to extraxt the .zip file using a software like Winrar or 7-zip or any other of your choice.
In the extracted folder there should be an executable file, which you should be able to run and install AURA with.
Where exactly do you encounter problems doing that?
Even easier would be an installation via CD if you recieved one with your ASUS product.