When downloading, ensure you extract the folders directly into your OMSI 2\Vehicles directory. If you are using the bus on maps like New Territories East West Kowloon
You can find recent versions of the E6X and similar high-detail bus mods on dedicated community repositories: omsi 2 e6x download new
For players interested in downloading the OMSI 2 E6x bus model: When downloading, ensure you extract the folders directly