I downloaded v2.91. I copied my save from v2.81, just before the Imp evolved.The new children from Erevi and the succubus daughter got no sprite after they grow up, is that normal, or is it a bug? Plus, the option to change their name doesn't appear.
Everi already had a son (second pregnancy). His sprite is normal.
After that Everi had a daughter. Her sprite is normal.
Both of them are in the room above the succubus. The naming options works ok.
The succubus gave birth. Then got pregnant again and had a normal child. But she didn't named him/her nor gave me the option to name the child. And I can't find the sprite.
I had no problem with the new quests and all the new sex scenes are repeatable.
You can go sleep in Everi's bed and had the sex scene. I think not every night. Some nights the door is closed.
Shop in Greyport: first you find accessories for the Imp. Then materials to make perfume (essences).