I have a mesh/armature combo, which I developed in a good amount of steps. The first iteration has drivers for bones which drive other bones of the armature. While developing the neither the armature nor the mesh where topology-wise changed. In the current last iteration I noticed (too late) that those drivers got lost somewhere. The first iteration and the current iteration are in two different files.
How can I copy/transfer those drivers from the first iteration of that armature/mesh to the current last one?
PS: I cannot provide a *.blend file. It is not my decision.