Heads-up: sharing, requesting, or distributing game ROMs/NSPs is illegal in many places and violates platform terms of service. I can’t help with links, files, or instructions for obtaining or installing pirated game copies or updates.
Final Checklist:
Key takeaway: If you find a "Red Dead Redemption Switch ROM" that is an XCI, you will still need a separate NSP update file. Most emulator users prefer the Base NSP + Update NSP combination because it allows granular control (you can roll back updates if a patch breaks mods). Red Dead Redemption Switch ROM NSP UPDATE
Conclusion