They released new version with ton of content recently, so it might be great time to try it!
First thing you need is Data files. It's all models, textures and other assets pacages, packed in .bsa archive for easy install. Download one you need - HD version or vanilla level textures.https://www.nexusmods.com/morrowind/mods/44537?tab=files
After you donload it, there will be two files
pt_data.bsa and TR_data.bsa
Drop both into you mods folder to other .esm/.esp/etc. files. Now you need to register archives. Go to OpenMW.cfg in your documents/my games/openMW folder
There almost from start of file after you open it with notepad will be
Last two lines is ones you should add and save file.
Now download mod itselfhttps://drive.google.com/open?id=1PwfRTmr8ktmJ-lbKr4pc0AeOcn92c2TK
here from main TR link or on nexus if you like it herehttps://www.nexusmods.com/morrowind/mods/42145/?tab=filesMusic addon will not work on OpenMw yet as I know and ehh I play with vanilla ost too, it's recent and really opotional
Inside you will have some files, inside CORE
folder this is all you need to play mod - it's actual main release. Faction integration
made some additiona to vanilla factions - like requrement to pass mainland quests for House telvanni in order to finish their questline. If you'll continue play from existing save, not install it - for fresh game, well if you want it, you may.Preview content
is landsmass of morrowind province that was unreleased. It have different degree of state - from just brown highmap to detailed areas with NPCs, but this is something that released just to give you "taste" of what will come. It is unfinished, may be redone in future compleatly, may not have quest, NPCs or interiors at all. Picture show what currently is released land - TR_mainland and what is still in preview.travel
folders add NPCs and options for existing NPCs of travel to mainland cities from vvardenfell - boatmans, magic guild teleportation, ships etc. 2 versions for just mainland and mainland+preview
Another folder for old script abot mods, you'll not need it.
And activate it in launcher and you ready to play it! If I remember correctly, it better for TR_preview have lower priority in launcher than "official mods and plugins". Activate all files and you are ready to go.
Regards of playing, Mainland part of mod finished, with NPCs, quests, factions, all things you may expect from original game and more. However, most quality and most up-to-standart content is in last 2 releases - on pic 2 - Old Ebonheart area and Aanthirin region with hell lot of content. Previous regions not bad, but you'll see what I mean when you get to it. It's more "vanilla more" with obvious that it is a mod in places, while new releases is above original game content quality. I recommend you just go directly for Old Ebonheart city as start point of exploring and progress. They'll improve and add more content to old releases, but it be later, when they finish province.https://en.uesp.net/wiki/Tes3Mod:Tamriel_Rebuilt
here is UESP article on it. From here you can also find quests and NPCs articles https://en.uesp.net/wiki/Tes3Mod:Tamriel_Rebuilt/Quests
it can help you. Obviously it's not all of them - like Old Ebonheart release quests there have names only, not articles and Aanthirin is still new relese so there not even metions about it's quests, but this is all you get for now.
Mod progress, I guess next release planned somewhere in February, mainly bugfixing and Dominion of the Dust release. On last pic you may see plan for next releases