You will find the file labeled similarly to: Red Dead Redemption [01007820196AA000][v65536].nsp (Note: v65536 is the hex code equivalent for version 1.0.3 on many release sites).
Was this the technical/historical perspective you were looking for, or were you looking for a guide on how to specific NSP update files? red dead redemption switch nsp update
What it doesn’t fix: The occasional pop-in of rocks or cacti two feet in front of your horse. You will find the file labeled similarly to:
We tested the game on a Nintendo Switch (OLED model) with Mariko chip, running Atmosphere 1.6.2. Here are the real-world improvements from the latest . We tested the game on a Nintendo Switch
Let's address the elephant in the saloon. Searching for "red dead redemption switch nsp update" usually implies you are using a backup copy of a game you may not own. While modding your Switch is legal in many jurisdictions (for homebrew), downloading NSP files from the internet is piracy.