How to downgrade Our trial version?

We are currently trying out sketchup and Vray trial.
vray only works on the 2016 version of sketchup…

How do we downgrade our 2017 sketchup pro version to the 2016 version, so that more rendering extensions can be compatible with our trial?

We have same issue, as vray is not working with 2017, and we need a key for 2016, :frowning: how to do it ??

You likely wait until after the holidays are over.