Where can I download the latest version of 1.0.2 protocol?

My current version:

chirpstack-application-server_ 3.17.6

chirpstack-gateway-bridge_ 3.14.0

chirpstack-network-server_ 3.16.2

Are there any updates above?

I’m not sure if I understand your question, but if you are looking for the LoRaWAN specification documents, then please take a look here: Technical Specifications