How do I activate the Light version in the Trial version?
On a fresh install, Opus should ask which version you want to try the first time you run it:
If you want to switch versions after that, you can do so using the Licence Manager window (provided an Opus Pro certificate hasn't already been installed):
I have evaluation version 10.1 - the Licence manager does not have that option. I guess I need to uninstall and install the newest version to get the option to use "Light"
Ah, grab the newer 10.2 installer here if you want to try Light: