Without specific details on what "Update 1.4.2.0" entails, updates in games like "My Time at Sandrock" typically include:
: Added post-marriage quests for several characters, including Logan, Fang, Nia, Qi, Owen, Amirah, Grace, Justice, Mi-an, Owen’s Romance Quest My Time at Sandrock -NSP--Update 1.4.2.0-.rar
Do not attempt to open the NSP file like a regular folder. It is an encrypted package. Only a Switch CFW or Emulator can read it. Without specific details on what "Update 1