The theme version can be found in two ways: WordPress admin panel or main style.css.

1. Theme version in WordPress admin:

Login to your WordPress admin panel and go to Appearance > Themes where you will find Divi. Click on it and, in the pop-up window that shows up, check the theme version: 

2.  Theme version in style.css:

Go to Appearance > Editor and it should open up the style.css file first. Search for the Version there: 

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