Based upon the source code release of the classic multiplayer shooter Wolfenstein: Enemy Territory, the ET: Legacy project continues maturing on modern platforms with ET: Legacy 2.78 out now. This is easily the best and suggested way to actually play Wolfenstein: Enemy Territory now, as ET: Legacy comes with a ton of improvements over the original while keeping the gameplay intact.
This release is part of their effort to speed up development and they said version 2.78 had a focus on "improving the competitive side of things" along with other general fixes.
On the gameplay side the on-screen blood effect has been redone. It's now more clear for players giving a directional damage indicator on the screen border to show where you're being hit from so it's less intrusive and takes up less screen space.
For the competitive side of things they adjusted the FOV range to 75 - 160, wounded players shouldn't get stuck in solid, many hitbox improvements, collision detection improvements and more.
Game engine improvements include a better OpenAL sound system, a removal of various frame-rate dependencies so you can crank it up to 250FPS resulting in smoother gameplay and more accurate hit registration, a server-side demo feature, a bunch of non-ASCII character crash bugs were fixes and a fix for airstrike/artillery plane and explosion behaviour .
You can download and play free from the ET: Legacy website. Seems you still want the 32bit build for best mod compatibility overall.