Where I can download 10ed codexes? Not paying GW shit.
We don't pirate stuff here, and thus I would encourage you to give your friendly local gaming store your funbucks for a codex.

:jew: :moneybags: :britishflag:
... I would certainly never point out that the 4chan /tg/ 40kg threads have regularly updated torrents and direct download links for every single codex going back to 1st edition Rogue Trader, which is where I'd look if I needed a codex. I certainly wouldn't point out the mega they link to has Custodes, AdMech, Agents, CSM, Dark Angels, GSC, Necrons, Orks, Tau, Tyranids, and the Rulebook all waiting for your download, while the Marines one is in the other
(Also some smartass should take 7th/8th/9th/10th whatever and make their own serial numbers filed off rulebook -- yes, I know One Page Rules exists, this would be different -- and release OpenHammer or TauHammer (for the greater good!) to the universe, permanently fucking GW out of control of their IP.)
I've started printing up an Imperial Knight force. There's a great Ortus_Forge_Armigers_Supported_bySaidon STL batch going around Telegram for the Armigers at the very least that you can print in two Saturn 4 Ultra plates -- one print for the sprue of common parts, one for the sprue of Helverine / Warglave / Moirax specific parts, or one BIG plate full of everything you need to make 1 (2?) Helverine or Warglaves at once. I'm going to figure out how to get at least one done and then do a test fit and paint. I figure I can mix up half, quarter, segmented, etc black and white and it'd generally look fine as long as the themes were fine across the entire knights.
Some discussion earlier in thread had me thinking of a Malal themed Knight army, since painted quartered white and black armor would be WAY easier on a knight.
My quick little
my dudes pitch is "What if you were a group of loyalists who survived a bloody battle defending your world, only to discover the Imperium had written you off as acceptable losses, choosing to sacrifice you for
your more prosperous and politically connected neighbors the greater war effort?" So in my mind you get some rather broken, hate filled Knights that are just shy of openly hostile to the Imperium, especially their neighbors, the kind that have taken secret oaths to royally fuck them all over when they can, but know they can't do it
yet. White and Black quartered armor, iconography of a chain being broken, fire at the edges of shields and the like.
Didn't realize they're still missing their codex, that's hilarious, need to read the 9th edition codex to refresh my memory on the faction lore.