Well,you could always rummage around an find a copy of CS4, I suppose.
I've read many times from many sources that there are NO plans -- none -- to bring that feature back. You may have liked it, but the vast majority of users, not to mention Adobe employees, regarded it as lame, half-hearted attempt at 3D.
What version of After Effects are you using?
If you have CC or CC 2014, I'm pretty sure you can import a 3ds into Cinema 4D (which comes free with After Effects, by the way).
The Cineware plugin is a lot less buggy than the old Photoshop Live 3D way.
Szalam is correct.
We get very few requests to import Live Photoshop 3D layers into After Effects, so there are no current plans to incorporate this feature. Going through an actual 3D application like Cinema 4D (included with After Effects) is generally a much better way to go.