Because LL FourPlay is a DLL-based plugin, it is strictly tied to your Fallout 4 version.
The original FourPlay worked, but it was clunky. It suffered from:
However, Four-Play was eventually abandoned. Most of the modding community migrated to , which offered better stability, more frequent updates, and a more robust framework for mod authors.
: Usually version 1.39 for the older game build.