Hello Salk. Great mod. I installed it along with a bunch of others through the Big World Setup for a run through BGT as a solo sorcerer. The scaling familiar works well and the lack of permanent con damage makes it possible to use the familiar in combat.
However, the familiar never leveled up with me. I had to attack the familiar, making it leave, and summon a new one, which would gain the proper levels. Not a huge problem, though it did get a bit frustrating once I got to Amn. Familiars can only be summoned outside, and the cowled wizards don't like that very much .
When I hit level 12, I tried to summon a new familiar again (some nice abilities kick in at 12), but the familiar no longer leveled up on cast. Reverted to an earlier save, tried other familiars; same results. Any idea what the problem could be?