1-Extract everything from the zip file
2-Then download and install Ryder Mod Manager version 1.2+.
3-Turn on the mod manager and click File -> Profile. Once there click on Add Profile and select your F1 2010 game folder. Once done, make sure F1 2010 is selected in the list and press ok. Now you should be at the main screen.
4-Press File -> Open -> Folder and select the Season 2011 folder with all the files in it from where you extracted it.
5-Once its loaded into the list select it and press Install. Simply follow the Install Wizard until the files start installing and press Finish when its done.
6-When in game do not use a prexisting profile but instead make a new profile so that you have a new savegame.
7-Enjoy!
I've reinstalled the game, I followed all of these steps and nothing happens. I have f1 2010 like the first time withouth mods...:S