- Demos under the Demo main folder can't be played
- Demos under sub-folders of the mod folder can't be played
- Only demos under the direct root of every mod folder in demo browser window (it's demos sub-folder of the mod folder in the filesystem) can be played
If the button is still disabled, please check the folder you setup as the Game main folder in the Settings window.
If iw3mp.exe was not found in the parent folder, demos can't be played as well.