You can find these by looking at the "History" tab on SteamDB for the year 2013.
Do not click "Play" in Steam. Instead, navigate to the local files: Steam\steamapps\common\Counter-Strike Global Offensive and launch csgo.exe directly as an administrator. Method 2: Using Steam Depots (For Specific 2013 Dates) Csgo 2013 Version Download
Official matchmaking for this version is offline. However, you can still play with others using these methods: You can find these by looking at the