I believe "sync slot" is available in that code version. If the desired code is on the master you could push it from there to the other nodes.
Are you sure that code version will provide everything you need? Finding code has gotten a bit more difficult, but TAC is able to help and can even get you a download link if needed.
I don't see that code version either. It goes from 15.5.3.4 to 15.5.2.9, seems odd, TAC might be a good option.