Guys, do you really think it's that simple? Get the source code and fix it with no time?
Most of the scenes inside the modules folder have already been fixed. If someone takes the effort then will find them on this page.
The game has been made for at least 8 years and contains the effort, but no guidelines within the codes, so its inside is a very very complex thing. Anyone who sets their mind to it to continue (or at least try to fix ''''all'''' bugs) must reverse engineering first to understand how it works partially and simultaneously. Also need a lot of skill in programming, animation, art, design, etc to be able to do something with it. And there is always the possibility that something will go wrong.
After that? Everyone will shout for something new (new concepts, new addons, new animations, new scenes, newnewnew).
New parts mostly cost money, and rarely free if you don't do it yourself (and try keep game legal). If you do it, cost a lot of time and require more advanced skills in modeling softwares (like Blender, Daz studio, 3DStudio, etc). If all things above do it yourself alone it cost a serious months (possibly years instead) to can be release something acceptable. That's one of the reasons why the developer only released exclusively new scenes in the last periods (it's the easiest part of this). To protect the dev: it can be read from the codes that there were efforts and abandoned things, like erecting male genitals.
But the reachable source is old too, it is the build of LP v5.9, after that version followed 20 more versions what isn't included in it. So the whole possible future project only can start from there (without like the lactation official mod, and so on, whats listed in details in the changelog).
Stepping further on start using unreal engine 5 is can be a 'gamechanger' decision, but it comes with a lot more work to do.
Firstly migrating the project from ue4 to ue5 isn't easy as it looks. It requires work to make the new version basically usable on the new engine with fixing some obsolated elements. After this practically it needs redesign the most visual part of the game. Without it, however, it is unnecessary to use it. The 'already in' parts doesn't require new technologies like Nanite or Lumen, or for example the clothing parts are 'static' so isn't require phisyx (hasn't simulate), so the new Chaos clothing factory will be useless, the game hasn't much big scenery or what use water element or a great amount of particles, so the Niagara will be useless, etc. But all of this can be implemented later.
In my opinion, the best solution would be if the developer continued his project. Or at least declare that he (neverever) won't and make his latest source code available so that it's a littlebit easier to continue if someone wants to try.