Edit 4 (yes a lot of edits): GiantAxe has an even better post over here: https://us.forums.blizzard.com/en/warcraft3/t/for-those-who-want-to-play-classic-warcraft-3/15598/2 Make sure to check it out! They even detail how to play with LAN over the internet using Hamachi etc.
I posted about this in another thread called “Reforged is a forced downgrade for classic users” by Bakker, and that post is bound to be buried fast.
So, to reiterate and add:
For those who are infuriated that they’ve been redirected to download Reforged when downloading either the TFT or RoC client, here’s the legit way to get back to Classic in the latest patch. Please keep in mind that if you don’t have CD keys, you’ll need to have your copy of Reforged on hand so that you can play the classic version.
If you download Warcraft 3 Public Test instead of TFT client (haven’t tried RoC client), you will download the classic version. You will be asked for a RoC CD key, and once you input that, you’ll be good to go.
I tested LAN with the Public Test version and my mate who has Reforged and it didn’t work. If you have a friend who also has the Public Test version, try using LAN and let me know whether it works or not.
Battle net in this version is also a ghost town - servers have been taken down in favour of Reforged it seems.
There might be slightly less legal ways to get around not having multiplayer and/or LAN, but those will be things you’ll need to find on your own. If you know a way, please do not post it below for relatively obvious reasons.
Hope this helps
edit: Please make sure to spread the word so that your mates won’t be so stressed out and angered that they can’t play their old game again! Even if this post gets deleted, this info needs to be out there - and if Public Test is removed… RIP Blizzard
edit 2: Forgot to include (again lmao) that if you’ve purchased Reforged and don’t have old CD keys, don’t get a refund! You can use your copy of Reforged to validate your access to Classic WC3.
edit 3: I’m mega potato, just found an older thread that basically has this but more in-depth and allows you to go to older patches. Ignore me lol
Edit 7: (From the user MajorFoley) For those of you who want to still play their classic saves, go to the folder in question and copy the saves located in the warcraft 3 folder into the warcraft 3 Public test realm folder. This is for classic to PTR so you can continue playing your classic saves, as far as i know reforged doesn’t work with em at all:
“…create a profile i think then copy the contents from warcraft 3 into warcraft 3 public test from this location
C:\users\user\saved games\warcraft 3 and c:\users\user\warcraft 3 public test. Just copy the contents from the former into the latter and you should be good to go. It should work if you pre do it too but its easier this way because it creates the folder.”