Affected version: 2.0.757 (Windows)
Minecraft version JSON files are not formatted anymore once the launcher read them and wrote its content again.
- Download https://s3.amazonaws.com/Minecraft.Download/versions/1.11.2/1.11.2.json
- Open it with a text editor
→ The file is formatted with line breaks and indentation
- Open the launcher and start a 1.11.2 profile
- Open the JSON version file again
→ The content of the file is all in one line