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I found some Gatherer DB and it looks fine. Maybe it is incomplete but still helpful.
https://www.dropbox.com/s/4k2b5mtojscgkv5/GathererDB_Wowhead.rar?dl=0

I have the same problem. I need to Gatherer on WotLK 3.3.5a but I cannot find the right gatherer addon and gathererDB. Either one of them is old or too new. Link in post from @houm is probably old...