Ryujinx LDN 3.1.3 is an older, specialized "Local Direct Network" build of the Ryujinx Nintendo Switch emulator, specifically designed to support multiplayer features like ldn_mitm for connecting with modded physical consoles. Availability Notice
Official Ryujinx GitHub: The official Ryujinx repository on GitHub (https://github.com/Ryujinx/Ryujinx) provides the most straightforward and safe way to download the emulator. From there, you can find releases, detailed instructions, and a supportive community.
A "portable" build means the emulator doesn't scatter files across your Windows folders. This is ideal if: You want to keep your emulator on an External SSD or USB drive.
If you're specifically interested in downloading Ryujinx for a legitimate and safe experience:
It sounds like a mundane technical request—a specific version number of a specific software. But the obsession with this specific build tells a fascinating story about the collision of open-source development, the desire for multiplayer freedom, and the unique demands of the portable PC gaming renaissance.