Hi Kevin,
I reinstalled the engine again and made sure the path was definitely set to: "C:\Program Files (x86)\Steam\steamapps\common\Divinity Original Sin 2\Data\" but I am still having the same problem. I set the path through the explorer and added the "\" at the end of the path.
Here are images to ensure I properly set everything up this time:
Data installation:
https://imgur.com/a/3KLMoData path:
https://imgur.com/a/3sAPECrash:
https://imgur.com/a/bYsGZI do not have the Divine Ascension DLC. Should this make any difference?