Can't install Warcraft III digital download on Powerbook G4.

Hello. I'm using a pretty old Powerbook G4 Mac though it is more than enough to run Warcraft III. I used to have the CD, though I lost it so I went on the Blizzard store to give them my CD Key for a digital download. I got downloaded a "Blizzard Downloader" which started a download for roughly 650mb. After it finished I clicked on Warcraft III installer, and it came up with a animated menu.

Play Game
View Manual
Contact Support

So I clicked on play game, however the screen pretty much just reloaded and nothing else happened. I keep clicking it and nothing else happens. There's no error message or anything so it's been pretty hard to search for similar problems.

Also I don't even know if I'm doing the installation correctly. In the folder that the downloader downloaded there is:

DirectX
Installer
Installer tome.mpq
Installer.exe

I click on Installer and it has the broken menu I said earlier.
Installer tome.mpq is roughly ~550 mb and when I click on it it says "Insert Warcraft III disk" which doesn't make sense considering it's a digital download.
And Installer.exe and Direct X are just things I have no idea what they are.

Hopefully some people actually read this post. Any help would be great.

Um. I dont really understand. If I rebooted the computer a new option would appear? :/ Well anyways I tried and it's still not working. I even redownloaded the installer. No luck. D;

It's definitely the mac version. If I click "Windows" I wouldn't be able to run the downloader at all.

Also I've tried to contact blizzard. They're not really responding.

I guess the only thing I can do is buy a new copy of the game. D: