This map only works with BKP's Open Autos Pak. Place the pak into BH-RT's data folder.
When downloading with IE (or Edge): the file might be renamed to .zip so rename it back to .pak!
When downloading with Chrome: right-click the download link and select 'Save link as...' instead of just clicking the link! Chrome doesn't seem to like pak files ;-)
Downloading with FireFox should be ok.