Some doujin works come with interactive elements (e.g., HTML5 sleep timers or looping video). If RJ01062044 had a technical issue—such as a corrupted track, volume spikes, or broken chapter markers—the creator might release an official patch. The "patched" version would be the updated, clean copy.
Check filename or source: If you downloaded RJ01062044_patched.zip or similar, look for a readme.txt or patch notes. nemuru koneko suimin no machi rj01062044 patched