Kadence Toolkit old version

Hello,

I am using the virtue theme free and when I made the update of the kadence toolkit a few days ago, my website showed blank. I need to desactivate the plugin to make my website works correctly again.
Do you know whats wrong with my website? or how I can reactivate the old plugin version?

my website is: http://www.anteam.ch

Thank you in advance for your help,
Best regards,
Aari