When starting the game, it asks for the first disc.
You do not have the original discs, so you do not have this one either.
To play the game, you have to:
- stop the game first
- copy the original program file sims2.exe (which usually resides in
 "C:\Program Files\EA Games\Sims 2\TSBin\" or whatever comes close)
 with the one enclosed here.
- Start the game

I don't understand what it means. Copy what, into where?

PM me if you need help.

-------
In a world where the broken dance
on shards of glass

You need to extract the files and run the setup. then u need to open the file directory of the game or whatever and copy the crack into that folder and it should work.