The download is only 241 MB and purportedly bug-laden and missing turn-based combat. Still, it's likely the last chance die-hard Fallout purists will get a taste of the post-apocalyptic franchise with the old engine. (Not everyone at Bethesda enjoys the Fallout engine, mind you.) NMA has also posted a guide for those working with the tech demo. For those interested enough to take it for a spin, let us know what you think.