Context: This update arrived several months after the game’s full 1.0 launch on consoles. On Switch, My Time at Sandrock has historically struggled with performance and visual fidelity compared to PC/PS5/Xbox versions. Update 1.4.2.0 aims to address many of those issues.
Downloading My Time at Sandrock -NSP--Update 1.4.2.0-.rar from unofficial sources:
If you own the game, updates are free and automatic via the eShop (or by pressing + on the game icon > Software Update > Via the Internet). Version 1.4.2.0 is available legitimately. My Time at Sandrock -NSP--Update 1.4.2.0-.rar
Recommendation: Delete the .rar file. Buy My Time at Sandrock on sale (it frequently drops to $20–25 on the eShop) and update it properly. The game is charming and worth supporting.
Because you are dealing with a [.rar] archive and an NSP update, things can go wrong. Here is the fix guide. Context: This update arrived several months after the
Error 1: "RAR file is corrupt"
Error 2: Tinfoil says "Missing Base Game" If you own the game, updates are free
Error 3: "Signature Check Failed" (Switch)
Error 4: Emulator crashes on launch after update