This Install Guide is a work in progress.
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OVERVIEW
  

  • Installing Warcraft III: Reign of Chaos
  • Installing Warcraft III: The Frozen Throne Expansion
  • Updating the Patch
  • Downloading the Latest Map for DotA
  • Playing DotA
  • Miscellanous

 
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INSTALLING REIGN OF CHAOS
 
Installing Warcraft III: Reign of Chaos
 
I'll be taking pictures now, as I do it. First, pop in your CD to your CD drive, obviously. Open My Computer (or something), click on the icon of the CD, and install it.
 
Step 1

  • Click "Install Warcraft III" when the Warcraft III Setup opens.
Follow the instructions given afterwards. Accept the Terms of Agreement, after reading it definitely,  and proceed to the next page.
 

 
Step 2

  • Enter your name and unique CD Key. I'll be entering an example name and my own CD Key as an example, but I covered it for privacy. I didn't cover the "example" name, of course. Click OK.
The CD Key can be only be legally found at the box of your Warcraft III: Reign of Chaos.
 

 
Step 3

  • Enter the installation directory. It's best to leave it as it is. Click OK.

 
Step 4

  • Installation will now begin. It will take several seconds, so wait a while. Grab a Coke, and watch some TV. After a few minutes, it should be done.

 
Step 5

  • After successfully installing, it will prompt you to place a desktop shortcut. Not necessary, because you'll be playing Frozen Throne, not this.

 

 

INSTALLING FROZEN THRONE
 
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Installing Warcraft III: The Frozen Throne
 
You just installed Reign of Chaos. Pop your CD out, and let's install the Frozen Throne. You know how to do it.
 
Step 1

  • Click "Install Warcraft III: The Frozen Throne" when the Warcraft III: The Frozen Throne Setup opens.
Again, accept the terms of Agreement, after reading it. This will lead you to the CD Key page again.
 

 
Step 2

  • Enter your CD Key. Click OK.
The CD Key can be only be legally found at the box of your Warcraft III: The Frozen Throne.
 

 
Step 3

  • Wait for the installation to finish successfully. Grab a Pepsi now, and drink up.

 
Step 4

  • Now this time, you'd want to create a desktop shortcut. Click Yes.

 

 

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UPDATING THE PATCH
 
Updating The Patch
 
Let's now update our patch to the latest one. This might not be the latest several months from now, but the concept still remains!
 
Updating the patch is very necessary. To get the latest patch, go here.
 

 
You need to the download the full patch because you're starting from the very beginning. The patch version can be seen at the bottom-right corner of the opening menu when you start the game.
 

 
Once you have downloaded your patch, it's time to install it.
 
Step 1

  • Open the patch you downloaded. It will do it's job after. When it's done, click OK. Uncheck the box if you want.

 
Note: When the patch starts installing, the screen will turn black. Then it will install by itself. After it's done, the screen will go back to normal.
 
The good thing about patch 1.22a, is that you DON'T NEED A CD TO PLAY THE GAME. (Actually been this way since 1.21b)
 
Congratulations! You now have the latest patch for DotA. It is 1.22a as of now. Refer to the changelog made by this update for more info.
 

 

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DOWNLOADING THE LATEST MAP FOR DOTA
 
Downloading the Latest Map for DotA
 
You can get new maps at this site. The latest as of now is 6.57b. I apologize because I made this guide when it was still 6.54b, but again, the concept remains the same as ever!
 
Step 1

  • Go here and download the latest map.

 
Step 2

  • If you're using Mozilla FireFox, choose to Save the File. You can't open it.

 
Step 3

  • Cut/move the file.

 
Step 4

  • Transfer the file to your Warcraft directory. Default directory is: C:\Program Files\Warcraft III\Maps\Download

 
The default directory is VERY important. Any tampering with it will have effects on Garena and downloading from Warcraft, especially when playing with others.
 
Congratulations! You now have the latest map for DotA. It is 6.57b as of now.
 

 

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PLAYING DOTA
Playing DotA
 
After all this, you can finally PLAY DotA!
 
But you have to adjust a few things as well. That's where Options comes into the picture. Click Options on the Main Menu (4th button).
 
Step 1

  • Adjust your VIDEO Settings.

 
These may be inaccurate descriptions. They are based on a 15-year-old boy's knowledge without any research about them.
 
GAMMA: Set it to what you want. It brightens or darkens up a screen.
RESOLUTION: I find the 1024x768x16 Resolution fitting for my monitor. If you have a bigger monitor, select a bigger resolution. A bigger resolution means a more detailed screen.
MODEL DETAIL: Defines how detailed models (units and Heroes) can be.
ANIMATION QUALITY: Enhances animation, i.e. attacks and stuff, as far as I know.
TEXTURE QUALITY: Improves the overall texture, from the menus, the terrain and the models. Everything.
PARTICLES: Enhances detail of other objects and doodads and the game. I don't know much.
LIGHTS: Sets how light affects everything. Brightens up the terrain.
UNIT SHADOWS: This must be on. This is important. If off, all units shadows are GONE. Mortred will kill you.
OCCLUSION: Determines how an object can be hidden by other objects. Best set to On.
SPELL DETAIL: This must be set to High at all times, for me. If it is set to Low, you will find it hard to notice when spells are around.
 
Step 2

  • Set your GAMEPLAY Settings.

 
The only things needed to tamper with here are:
 
MOUSE SCROLL: How sensitive do you want your cursor to be?
KEYBOARD SCROLL: Same here, but with the keyboard. (using ARROW KEYS)
ALWAYS SHOW HEALTH BARS: As of 1.22a, health bars can now be PERMANENT! Hurray! Check it if you want.
AUTOMATICALLY SAVE REPLAYS: This feature automatically saves replays inside your replays folder.
 
Step 3

  • Configure your SOUND Settings. Do what you want here.

 
Step 4

  • Enter your desired name. Then, click "Create Game". If there is a game present, you may choose to click "Join Game".

 
Step 5

  • This is a very simple step indeed. Click the "Download" folder.

 
Step 6

  • This is also simple. Click the map you want, then click "Create Game". This will bring you to another window.

 

 
Thanks to NNCCMMLL for the guide.