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There is no official DotA 6.90 by IceFrog. The official final map was 6.83d (or 6.88 in some circles). Version 6.90 is a fan-made modification designed to rebalance heroes and add new features.
Update: With the continued popularity of Warcraft III, the modding community has released unofficial updates. If you are looking for the Dota Map 6.90 AI (often referred to as "DotA v6.90 AI"), here is everything you need to know before you download. What is Dota 6.90 AI? For those who grew up playing the original Defense of the Ancients (DotA) on Warcraft III, the number "6.90" represents the final, "unofficial" version created by the community after IceFrog moved on to Dota 2. Dota Map 6.90 Ai Free Download