Salient and "WPBaker Page Builder" problem

Hi,
I have just purchased and domwnload the Salient Theme from envato.
I have a fresh hosted wordpress with Salient Theme installed.
But when I install and activate the “WPBaker Page Builder” Plugin => my wordpress crash totally.
the WP site and WP admin show a big “ERROR 500”
When I delete the “WPBaker Page Builder” plugin from installation with FTP, everything come back to normal.
The “WPBaker Page Builder” do not work . Please HELP