I seem to get this error too with my own save for SR4. I'm gonna try to see if I can talk to him via email.This editor really screws up my unlocks/upgrades on SR3 and straight up does not work for 4 it just gives me an error,
PC Steam Edition for both of them.
Unable to save!
Reason: Offset and length were out of bounds for the array or count is greater than the number of elements from index to the end of the source collection.