What is the instalation code for PC game red alert 3

well, i dont know how to solve it , but in readme.txt file it says this:
1. Put here bitmaps for CDkey RA3Beta_code.exe program.
2. Remove this readme.txt file.

that file is located in Autorun folder of the pre installed game.

pls if anyone knows what to do help... I think it should be on the back of the manual or inside the back cover or the case the game came in. look for a sticker.