Can you please tell me what to do.
I don't know what the RHI Mod is so can you give a bit more information please?
Rural Highway I....., Made by nam as an add on mod.
You mean the RHW? And how exactly are you not able to download it.
If you're not seeing the "Click here to download button", you need to be registered and logged in on the LEX. (LEX registration is separate from Forums registration.)
Also, if you've try to download a certain file more than a certain number of times per day, it will prevented you from downloading it again for the rest of the day. This is to preserve bandwidth and prevent potentially illegitimate download count boosting.
Edit: I've moved the topic to LEX Support as well--it's not a tutorial on playing the game.
-Alex