Jesus Christ, I literally suffered for 4 hours to finally get this extension running on the L4D2 server.
If someone, like me, after reading the instructions 10 times can not understand how to install the extension, you need to do the following:
Download the latest release from the
GitHab for your server (I have a server on Linux, so I downloaded
1.2.3c package-lin.tgz).
Download attached archive (
SteamClient.tar.xz) from the first post of the thread.
From this archive transfer folder
bin with all files to your server. In this folder is the file
steamclient.so for L4D2, which I could not find and understand where to take...