You acquire them with the disc when you purchase the game.
The key codes are on the back of the manual.
Use a fashdrive and copy the files over
At this time the Diablo 2 and Expansion Pack are for buying only. There is highly unlikely that their will be free any time soon. Blizzard still asks for money on games they did about 15 years ago like "Black Throne" or "The Lost Vikings". You can always buy the Diablo 2 and Expansion Pack on the online Blizzard store, or at a retail store. The prices are not that big, and you can always find them for a really good price on Amazon or Ebay kind of online stores. (At the time I wrote the answer, I found an online deal for CD-key's for both games at 10$) I've added the Blizzard store link for the Diablo games and stuff.
The CD key for Diablo 2 was printed on the original CD case for the game. If one has misplaced the original case, there are several sites online where people may list codes for free.
If you purchased the Star Wars Empire at War expansion pack from an online vendor, they should email you with the key code required to play the game. If you bought a physical copy of the expansion pack, the code will be included in the paperwork, or printed on one of the discs.
There isn't a specific product key but if you want to obtain one then you will have to buy one off of the site that sells them.
Should be a place in the installation program that has you put in the CD key.
diablo 2 1.00 who to use the black tower key
fisrts put in expansion disc then copy i think its the dmx files all of them in to your diablo 2 folder then it should work or you can go to www.gamecopyworld.com and download a nocd fix. It is not illegal if you have got an original CD key and copy of the game to do this. Hope i helped
Yes.
you can either get key gens for the keys or look online under google web search and type in "Diablo 2 CD Keys" or "Diablo 2 LOD CD Keys". Im sure that will come up with some cd keys that are used for diablo 2 and diablo 2 lod.
No D2 and D2: LOD have their own different CD Keys.