Note a possible conflict:
Note: Rise of House Telvanni conflicts with Nevana's Twin Lamps & Slave Hunters v1.5. Both are OpenMW compatible as far as I know, so if you want to play them both, you need to pull out the extras patch from Rise of House of Telvanni named :
RoHT TLSH Patch.esp
This makes the two quests compatible.
Also note this big !! note !! in Rise of House Telvanni for players:
NPCs that must be alive
Whatever you do in Morrowind, don't kill Aryon, Divayth Fyr, Yagrum Bagarn, or
Edd Theman (Fast Eddie). I need them for RoHT.
Also note Rise of House Telvanni conflicts with Balmora Council Club, which is listed as Open MW compatible in the OM wiki mod list, so be sure not to install them both.