The sims 3 season;asking for disk?

I was following the installation guide. I opened 'Sims3EP08Setup.exe' and then enter the serial code.
But when it started to install the Sims Season. A pop out appear and ask for disk (During the installation).
What disk was it? If I'm not mistaken, there shouldn't be ANY pop out asking for disk right???

Please help me...Thank you...

Edit: I've download Ultimate Fix
I'm up-to-date.

Hello,

Sorry for the late reply!
Please open the .rar file you downloaded using only WinRar, which can be downloaded from www.games4theworld.org . (If you use any other software than WinRar, like WinZip or 7-zip, the files will get messed up!)
When you've opened the file using WinRar, select áll the files in it and drag & drop them to a folder on your Desktop. When the extraction is done, close the .rar file and open the folder on your Desktop. Now, start by reading the included "# Installation Guide.txt" and you should be able to get the game to work yourself. Good luck!