How do I find out which install version I have?

mediapovera / 2017-10-23 20:36:26   

I thought I was using V2 for my main site but i'm not so sure i'm not using V1. How do I find out? As my server has now taken down my indexhibit site as they say its not compatible with php7 I need to know which version I am actually using as it will affect the install.
thanks

This thread has been closed, thank you.