zain86us says:

what you download are images of original cd there are two ways either you burn them on cd's again or virtually use them to burn them on cd you need "nero burner" and to go on virtually you will need a software called "alcohol 52%" or "deamon tool" the choice is up to you
then lets say after doing above you inserted first cd and a menu will come up choose full installation then it will say insert serial key.now there will be a folder name keygen in the torrent you downloaded in side that folder there is a program named "diablo II keygen.exe" just run it and it will generate a key copy and paste that key where its required and when installiation is finished there will be a folder name crack in one of the cd's inside that folder there is a program "game.exe" just copy that and paste that where you have installed the game and then start playing you can install expansion pack just like that and if you want to play expansion pack without a cd then copy "D2xmusic.mpq" and "D2xvideo.mpq" from the cd and paste them to where you have installed game thats it