If there really are incorrect paths in the Config.xml file on your system, I suspect that the game was not purchased via Steam or Epic Games. Only their path (as 'WorkingDirectory') should be included here.

If you still have other paths in the config file, the config file may have been subsequently edited (e.g. for mods). To restore the original status, it is sufficient to delete the file in the path where the config file is needed (for the Steam version: C:\Users\[your Windows username]\AppData\Roaming\SpinTires MudRunner) and then restart the game. This should recreate the config file.

The media paths in the config file only refer to zip files of the game directory (without specifying the entire path). Nothing more can be found in it and won't be necessary.

It would be strange if some media were actually missing. It's more likely that not all of the requirements that the game needs are met... Does your machine meet all the requirements?