So after this recent update (June 16 2021) is current date. I have both of the versions installed. If you have not done this here is the link to how to do that. (Update 2024) According to some in the comments this still works lol.
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Installing both versions
• The Isle - How to have Evrima AND Legacy (...
So after you do that then you can do what I show you in the video to fix the issue of legacy not launching properly from steam. I just figured a lot of you would have both versions installed and didn't see a video of how to fix this after the recent update. Hope this helps guys :D