The standard Windows 10/11 launcher (from the Microsoft Store) is notorious for Error 437. Mojang offers a standalone (the old-style launcher).
If you have tried all the steps above and are still seeing the message, the issue might be on Mojang's end. Check the official Minecraft Help Center for known issues. minecraft error 437 download
First, it's important to distinguish between the real technical error and the fictional horror story that shares its name. The standard Windows 10/11 launcher (from the Microsoft