How to play the campaigns in the standard version of Heroes of Might and Magic V, specifically the Tribes of the East expansion.

https://disk.yandex.ru/d/1JRV4blS7hXAxw
Here is the link (which I found in 30 seconds using Google). And you should learn how to formulate search queries correctly in the Google search engine.

I'm not sending you to Google because I don't know the answer myself, but because I know for sure that this information can be found on the internet.