Wow, only 3GB? Must be downscaled to SD or lower, too, I'd guess.

Yeah, as others have said, the official Harmy releases of SW v2.5 are an ~18GB MKV and an ~8GB AVCHD (for burning to a dual-layer DVD and watching on a Blu-Ray player). There's also a ~4GB single-layer DVD re-encode that was done with Harmy's blessing, but not by Harmy himself, that has the 5.1 AC3 as the only audio track. And it's in DVD format (VIDEO_TS folder, or maybe an ISO image, not sure which), not a single AVI or MP4 or anything like that.