How to install a trial version of TCS 8.0 and remain the TCS 5 unchanged

Hi,

I'm working with TCS 5 and want to find out if TCS 8 is a nice-to-have or must-have.

How do I have to install TCS 8 to be able to test the new features so that the existing TCS 5 remains unchanged.

Is it only a check box within the installation wizard or should I test the new version on another PC?