Oh, that's strange... Sluggs' post with all the links is gone, too.
I'm not sure where else to find a copy, except directly from a player who has it installed or saved somewhere. Do you just need the set pieces cast?

Edit: You'll have to change your display name back to "neonribbon" (or just remove it) in order to reply to topics, by the way. That feature is unfortunately broken.

Weird, wonder why he got rid of it.

Anyway...all the downloads to the different TEF versions can be found here on this forum.

Hrm. Sure enough... it's the only one that you can't download, too. Weird.
I'll dig around and see if I have the original installer somewhere on my laptop. I doubt it, though.
I may be able to just copy the game files for you if I can't find the installer.

Nope, don't have the original installer. I'll tinker with it and see if I can get a functioning version that doesn't save my login/password to the files.

That was a no-go, but I DID find the 3.12 to 3.13 patch. I'd forgotten there was a patch option for the pre-existing players. They usually do that. It's a little round-about, but it SHOULD work if you download 3.12 first.
http://www.gamefront.com/files/9401233/The_Endless_Forest_v3_12_to_v3_13_Patch

It has you answer a few brief survey questions (mine were about music) - presumably to prove you're human - and then you can download.

I didn't fully test it, since I don't want to mess up my already-installed files, so please do let us know if this is a valid workaround.

Good find!
I downloaded all the zip files last night lol. I don't have mirrors uploaded anywhere, but at least they're safe-ish for now and can be uploaded if need be.

No clue. I wondered if maybe it had to do with hosing cost, but they're almost all on Mediafire or similar third party free hosting services, and I find it rather bizarre that only v3.13 is no longer downloadable out of all his original links.