Where are the manuals?

Back in 2002 there was a manual PDF in the game folder, one for the original game and one for the Frozen Throne expansion.

Then the game downloaded from battle.net also had it until some version, I can’t exactly tell which.

Then the game launcher had a separate link to the manual, which is not there anymore.

Where can I get the manuals? There’s a whole lot of background info there and I need it.