Sometimes the launcher fails to download the "UPD" files simply because Windows restricts it from writing new data into the AppData or Program Files directories.
: Xbox Live or Mojang authentication servers experience temporary downtime. Step-by-Step Fixes for Error 437 1. Clear the Minecraft Launcher Cache Minecraft Error 437 Download UPD
He is frequently reported to enter the game in updated versions. Sometimes the launcher fails to download the "UPD"
Temporary downtime on Mojang’s authentication or content delivery networks (CDNs). Step-by-Step Fixes for Error 437 Minecraft Error 437 Download UPD
If you want, I can: