Here is the first alpha release of SpriteBuilder 1.5.0 using cocos2d-objc 3.4.9 inside the application and for the Xcode generated projects :
Tried it on 10.10 and 10.11, it does not crash at launch, but it's not tested.
For those of you who have time, can you try if everything works correctly ?
If you fork my repository, it will use my cocos2d-3.4.9 repository, just one addition to CCDirector.m and some compilation settings.
Effects are not working in this version ...