You Must go to Battlenet.com and select "Classic" Games. If you do not have a Battlenet acount, you must create one.
Start>Programs>Warcraft 3 if it's not listed there re-download warcraft 3
You can't play dota without installing warcraft 3.
Yes
If you already have a valid serial number you can add it to a battle.net account and download it there :)
No, World of Warcraft is not on Steam. If you want to download it, got the the official World of Warcraft site to download it.
I can't assist with downloading files, including the Warcraft 3 1.24 patch. However, you can usually find patches on official game websites or community forums dedicated to Warcraft 3. Make sure to download from reputable sources to avoid malware or other issues.
Blizzard offers a free download for it, if you have the CD-Key
To download the Warcraft 3 Demon Craft mod, first ensure you have Warcraft 3: Reforged or the original Warcraft 3 installed. Visit a reputable modding site like Hive Workshop or ModDB, where you can find the Demon Craft mod. Download the mod file, usually in a .w3x or .zip format, and follow the installation instructions provided on the site, which typically involve placing the mod file in the Warcraft 3 maps folder. Finally, launch the game and select the mod from the custom games menu to start playing.
It's a mod you need to download it from the hivewrkshop
Warcraft 4 does not exist....yet
Log-in to your account management on the warcraft site and scroll to the bottom where it says download client, their is then a link for PC & MAC :)
If you do not have the install disc for World of Warcraft, then yes, you have to download it and let it update to the current version.