I'd say all of this applies only for those who care about legality. There's a metric fuckton of games using 100% pirated assets or copied real porn images. The chances of a random f95 porn game dev who abandoned their project after v0.2 actually trying to run some sort of legal action across borders is close to zero in my estimation.
In my opinion, unless OP is trying to build a commercial, monetizable game from another dev's leftovers, then there is nothing to sorry about.
Note that for Renpy games, all the assets and scripts can be extracted using easily available tools, and then modified, extended and rebuilt into a "new" working game. So you don't strictly *need* the original files. However, for a 3d rendered game without the original Daz scene files it will be a lot of work reproducing the original look.
Yeah, my answer was from the perspective that you want to make a 'legit' monetizable thing. If you just want to make fan content, Ren'Py is almost impossible to encrypt - so you can download any game and do whatever you want with the files. Obviously, you won't have access to any 3D setups, so you will just be taking codebase and renders, which defeats the purpose, unless you want to redo the story, make mods, etc.
I downloaded a bunch of games from F95 that I liked just to study their assets and codebases - this is the beauty of Ren'Py.
And learning a codebase of another person - I wouldn't wish it on my worst enemy.
Btw, if you publish stolen IP on Steam - borders don't matter, you can nuke the game if you contact their support, and get the revenue in some cases. It gets a bit more difficult on other platforms, but doable.