I am playing with Tortured Souls 7.02 + RR 4.11 now, and it seems that the Aran's script somehow breaks, and he won't give the SSoB blade to the protagonist. Though I do not remember if he gives the sword in the chapter 3 or chapter 6? If it's the latter, then sorry for the somewhat premature report, since I am currently in Underdark in my run
It depends.
If the player sides with the Shadow Thieves, Aran gives him the SSoB in chapter 6. OTOH, if the player sides with Bodhi, he gets to kill Aran as a part of her final task in Chapter 3 and can loot the SSoB from his corpse. This is explained in the readme.
Otherwise, TS and RR seem to be working smoothly together. I have acquired some bugs with TS content, but they are most certainly not related to RR at all.
That's good to hear.