The Harry Potter video games are developed by EA games. EA's customer support will supply replacements for legally purchased lost product codes.
Legally, the only way to obtain the games is by buying them from a website called Direct2Drive, which was chosen by BBC Worldwide as the vendor for the North American version of the games. Unfortunately, the Mac version of the games has not been released internationally.
You can legally download games from the PlayStation Store on the PlayStation Network.
Steam games store your product key on their game server, not your client software. As long as you legally purchased your game and created an account, you will just log in as usual. You do not need your product key again, even if you unistalled the game at some point.
Fifa 08 is made by EA Games. If you open a support ticket with EA, they will hep you get a replacement key.
You can not legally download the games
homebrew
You don't download games legally. You buy them.
You can legally download free games at addictinggames.com and may other free gaming websites. You can also try playing free games online that do not need to be downloaded.
If you want to download The Legend of Zelda legally, you can purchase many of these games on the Nintendo eShop as Virtual Console games for the Wii, 3DS and Wii U
You can purchase legally downloadable PSP games from the PlayStation Store. Alternatively, you can also get them from PSPBlender for a $37 membership fee or from Amazon.
No PS2 DownloadingNo you can't. The reason being that the games are copyrighted.