Blizzard updated the original Warcraft 3 (the 2002 version) to run on modern systems, merging it with the Reforged client. If you own the original CD keys from 2002, you can install the game via Battle.net and play the "Classic" graphics mode without buying Reforged.

No. is a paid game on Battle.net, typically priced around $29.99–$39.99 . There is no permanent, legal way to get a free key without paying or winning an official giveaway.

On Battle.net , Blizzard allows you to log into your account on a friend’s PC. If a friend owns Reforged , and they are not currently playing a Blizzard title, you can log in and play it on their license. This requires trust and constant internet connection, but it is 100% legal and safe.