I have no idea why you would play this on the original engine, but it should work just fine as well.
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v.0.3
Resurrection! As OpenMW 0.45 added resurrecting player as a viable mean to continue playing, the resurrection script finally has a chance to work. Now only when you are dead, you are transported to the Heart Chamber, where "player->resurrect" comes to play.
On the sidenote, seems like some quests are really bugged, and I don't feel strong enough as to take repairing them upon myself. Not just yet anyway.
edit: I will upload the file after 16.04, as I am banned from uploading files till then :/
v.0.2
Changed one bigass op spell to power, so you don't abuse it, as per SpaceDevo's suggestion.
And I forgot to mention before, there is a point where you have to [...] and you would use the spell with negative effects on someone with whom you'd need to talk afterwards. Spell effects didn't matter, cause it was only to evoke script effects, so I changed them to positive ones - so you don't have to use "stopcombat" in the console. v.0.1
A simple hack, not even a fix. I've ripped all of the transformation parts from the scripts, so when you "transform", you stay you, just with some corprus stats (at least till some point, not spoiling it for those who haven't played it) and treated as a corprus beast by others (still, just till some point, you are not destroying your char with this mod).
Apart from the transformless (ie. bugless) transforms, I've made some spells needed to go through with the questline to always succeed, as I guess your transformed form had some bonuses letting you cast them. They may be op, but if they are, just don't use them outside of the quest, like me. It's your game, your decisions.
Installation: unmark your GHD esp, mark my GHD omwaddon and you are good to go.
Couple of things, which are the consequences of staying outside of normal society for some time: - either stack some repair hammers before going to Mr. Ur, or have some spare gold to repair your equipment at Red Mountain, which is a bit costly (being transformed you'd normally have claws, which you could "repair" for 0g) - same with everything you might need for, I dunno, 4-6h playtime, especially movement stuff (if you mind walking a lot - I didn't, it was actually nice change from fast traveling)
Ah, and spoilers, quite obvious, but I wish someone told me that beforehand - you won't be able to do the Temple questline, nor the Imperial Cult one, after joining House Dagoth. It makes sense, but if I knew, I'd make them before going GHD. Still, the mod is so great, you actually don't mind that that much.
Oh oh oh! And don't lose your damn Dagoth figurine! I fucking lost mine, dunno where is another, and now I can't restore my stats or cure myself for free :( Or talk with Mr. Ur via telepathy. ("COMMUNICATE.... THROUGH TELEPATHY -BIBIP BIP-")