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Quoted from "Tanio"

CS:GO version 1.21.5.4 "protobuf" beta is now available for download. This version uses Google's Protocol Buffers (protobuf) for network messaging. Developers of third-party CS:GO plugins should test their plugins with this version of CS:GO and report any issues back to this mailing list. We will ship the protobuf version of CS:GO in the near future.

To get the client, go to CS:GO properties, and select 'protobuf' on the 'betas' tab.

To get the matching server, use the steamcmd "app_update 740 -beta "protobuf". This should be done in a destination separate from the usual install dir.

We have made the protobuf source files that define CG:GO User Messages available here:
https://developer.valvesoftware.com/wiki/CS:GO_User_Messages

Thanks.
-Tanio

Quoted from "Tanio"

We have updated CS:GO "protobuf" beta:

- Added protobuf message for "ShowMenu".

- Protobuf files are available here: https://developer.valvesoftware.com/wiki/CS:GO_User_Messages

To get the client, go to CS:GO properties, and select 'protobuf' on the 'betas' tab.

To get the matching server, use the following steamcmd
app_update 740 -beta "protobuf
This should be done in a destination separate from the usual server install dir.

Correction to the previous email -- the version number of CS:GO "protobuf" beta is:
Protocol version 12162
Exe version 1.21.6.2 (csgo)
Exe build: 13:37:59 Jan 11 2013 (5179) (730)

Thanks.