Startup Issue with Subnautica (Legacy) - there is a new version availble

Yes, you missed my point. Support came with 1.8.0.0. The devs introduced some changes in 1.8.0.1 to allow custom data paths to be specified (important for a panel like AMP which has instance datastores), but there was a bug. That has been patched, and will be released in 1.8.0.2