I have saved an edited version of the West Coast USA map and seem to have overwritten the original. Is there any way I can get the original map back please? Maybe there is a way to download the file again? Thanks!
Remove the levels/west_coast_usa folder inside your userfolder. You can get to your userfolder through the launcher > Manage User Folder > Open in Explorer. Deep clearing cache may result in specific files being deleted/moved to a backup folder unwantedly.