Failed to download file

When I press play on java edition 1.21.5, it momentarily tries to download something, and then throws this error:

Failed to download file.
Name: 1.21.5.jar
URL: https://piston-data.mojang.com/v1/objects/b88808bbb3da8d9f453694b5d8f74a3396f1a533/client.jar
Filename on disk: 1.21.5.jar
Path: C:\Users\<user>\AppData\Roaming\.minecraft\versions\1.21.5\1.21.5.jar
Exists: Nonexistent