Press Win + R , type control firewall.cpl , and press Enter.
This 2,500+ word guide will dissect exactly what Error 437 means, why it happens, and—most importantly—how to permanently fix the “Minecraft Error 437 Download UPD” issue. Before fixing the error, you must understand it. Error 437 is a network-level permission error within the Minecraft Launcher. It specifically appears when the launcher attempts to download an update (UPD) file from Mojang’s servers but is blocked. Minecraft Error 437 Download UPD
Click Change settings > Allow another app . Press Win + R , type control firewall