After coming back to Forge with mods after a few weeks, whenever I launch the game from Twitch, I get an error.

Failed to download file, the file contents differ from what was expected.
Name: 1.15.1.jar
URL: https://launcher.mojang.com/v1/objects/7a762a59345c13af7d87111207a93f5a8607f6c0/client.jar
Filename on disk: 1.15.1.jar
Path: C:\Users\PC\Twitch\Minecraft\Install\versions\1.15.1\1.15.1.jar
Exists: File

I've seen similar issues related to different files, but none of them are for 1.15.1.jar