cannot install Sims 3

[SandArcher]

@Lorrainlovemax please explain. What's happening? Disc or download? Are you receiving any error messages? 

[Lorrainlovemax]

Hello,I bought Sims 3 late night expansion pack. And I have already downloaded successful, but I cannot install it, when I click install, there is a unknown error happened, I don't know how to describe this error, because the words are not English, it seems lolike Japanese or something, then I can only click ok, and cannot install it

[SandArcher]

@Lorrainlovemax can you post the message anyway? We can translate it then through Google Translate

Are you using a MAC or are you on a PC?