-download the protoc exec from here for your platform:
https://github.com/google/protobuf/releases/tag/v3.0.0
 
-download the pogo protobufs from here (just grab the whole repository):
https://github.com/AeonLucid/POGOProtos
 
-put protoc.exe with those files, then look on your phone for the game_master file. it will be: 'Phone\Android\data\com.nianticlabs.pokemongo\files\remote_config_cache \000....GAME_MASTER' where the section between 000 and GAME_MASTER will change based on the version.
 
-copy that file off your phone and put it with protoc, then open a command prompt, cd to the folder (or shift+right click and 'open command window here') and type:
protoc.exe --proto_path=src --decode=POGOProtos.Networking.Responses.DownloadItemTemplatesResponse src\POGOProtos\Networking\Responses\DownloadItemTemplatesResponse.proto < 000001588E7CB72B_GAME_MASTER > filename.txt
 
-change the game_master name to the one you're using, and filename.txt is your output string (change the name if you want).
 
-use www.diffchecker.com to compare with older versions and see what has changed