How to create a Post Grid to show Pages & Articles at the same time ?

I bought Post Grid Pro, installed and added my licence.

I just activated Post Grid Pro, and deactivated Post Grid (free).

I noticed WordPress tell me i need to install Post Grid Plugin to use Post Grid Pro...

But the web agency i work with tell me to not install and activate both of theses add-on.

When i go to WPBakery, i can open a new Post Grid BUT, i can't add both kind of contents : Pages & Articles at the same time. So, Post Grid Pro isn't working well because of what ? No PG Free activated or I missed a thing in WP Bakery ? Do i have to activate both of extensions ? The web agency tell me i may have a conflict with the same fonctions applied at the same time on my website...

Could you tell me how to do ?

Thanks.