Hi Beast! Have you followed the instructions available on the steam workshop page? I've copied them below for ease of access!
Dedicated Server
It's strongly advised to the run mission on a dedicated server to improve performance. To further improve performance for clients, 1-2 headless clients are recommended.
To install:
Subscribe to the workshop item
Find the file named (numbers)_legacy.bin at <steam install path>\steamapps\workshop\content\107410\2477873447
Copy and rename the file to vn_mf_latest.cam_lao_nam.pbo
Upload the file to the mpmissions folder on your server
For an alternative download, use a website for downloading workshop items such as:
https://steamworkshopdownloader.io/
Some hosting providers are also able to download the mission directly using a Steam Workshop integration.
In order to see the mission in-game, the server must have the CDLC loaded