Just like Angrytoilet said one post above, I think it would be a great pity if this system did not make it to future UE version/s. Even though I am currently using it with 4.12, I thought of it as a basis for any multiplayer project that we could start.
I have not tried the new version of Unreal Engine yet myself, perhaps I will look into it later on. That said, out of sheer curiosity, as I really like the system, what could the errors mostly be connected to in the new version of UE - I always thought, when talking about blueprints, that errors can only occur in case of deprecated nodes - but was the change between 4.12 and 4.13 really so drastic that it would make the system completely unusable ? (I know many things changed between 4.10 and 4.12 but when looking over the 4.13 change-log I found nothing of particular concerning blueprints, there were however a few fixes in the Datatables module)
I am asking so that I would know where is the best place to start before jumping to error logs.