The latest Addon Manager supports every version of P3D, starting with 1.3 and surely always worked with 3.3 so, whatever crashes you are experiencing, I don't think they are caused by the Addon Manager.
I strongly suggest to use 3.4, even if you are not interested in new features, if only for the bugfixes, which were a lot. And, it makes very hard for us to support you, since we are all running 3.4 now.
