Hi,
ok, what you need to do is the following:
1: take your original project as it was
2: update playmaker first, make sure it works
3: update Unity
If you update Unity first, then you will likely have more problems to bring up to par the assets because the unity api has changed and the assets do not support future versions of Unity, so alwasy update all your assets to their latest version on the asset store, and then update Unity.
Let me know how it goes.
Bye,
Jean