Hi and welcome
Is it “okay” to torrent the Despecialized Editions rather than download the long way? (Granted that I own the original trilogy on DVD)
“okay” is really all about a best faith effort to actually own what you can, and in this case you should really own the Blu-ray, not the DVD, as the Despecialized Editions are largely Blu-ray source.
where you find the files is up to you, but the trouble with torrents is that they are often not the original source, they might just have audio tracks trimmed to reduce size, but sometimes they are re-encodes or downscales.