[root88]

Just to confirm: I've tested it for a while and it gives me only false positives.

PHP Code:

#pragma semicolon 1

#include <sourcemod>
#include <SteamWorks>
char g_sLogs[PLATFORM_MAX_PATH + 1];
#define PLUGIN_VERSION "1.0.0"

public Plugin myinfo = {
    name        = "Free2BeKicked - CS:GO",
    author      = "Asher \"asherkin\" Baker, psychonic",
    description = "Automatically kicks non-premium players.",
    version     = PLUGIN_VERSION,
    url         = "http://limetech.org/"
};

public OnPluginStart()
{
   BuildPath(Path_SM, g_sLogs, sizeof(g_sLogs), "logs/free2bekicked.log");
}

public void OnClientPostAdminCheck(int client)
{
    if (CheckCommandAccess(client, "BypassPremiumCheck", ADMFLAG_ROOT, true))
    {
        return;
    }
    
    if (!SteamWorks_HasLicenseForApp(client, 624820))
    {
        //KickClient(client, "You need a paid CS:GO account to play on this server");
        LogToFile(g_sLogs, "%L doesn't have paid  CSGO.", client);
        return;
    }
    
    return;
} 


Spoiler

L 12/07/2018 - 21:35:44: [free2bekicked_csgo.smx] PeeX<382><STEAM_1:0:96689364><> doesn't have paid  CSGO.
L 12/07/2018 - 21:36:47: [free2bekicked_csgo.smx] conrad<385><STEAM_1:1:42473749><> doesn't have paid  CSGO.
L 12/07/2018 - 21:37:02: [free2bekicked_csgo.smx] NO ELOO<386><STEAM_1:1:67425153><> doesn't have paid  CSGO.
L 12/07/2018 - 21:37:26: [free2bekicked_csgo.smx] flubbershy<387><STEAM_1:0:132533300><> doesn't have paid  CSGO.
L 12/07/2018 - 21:37:55: [free2bekicked_csgo.smx] Xeno<391><STEAM_1:1:107043089><> doesn't have paid  CSGO.
L 12/07/2018 - 21:38:03: [free2bekicked_csgo.smx] DEDI<390><STEAM_1:1:116275325><> doesn't have paid  CSGO.
L 12/07/2018 - 21:38:43: [free2bekicked_csgo.smx] BUMBEL<393><STEAM_1:1:156158265><> doesn't have paid  CSGO.
L 12/07/2018 - 21:38:47: [free2bekicked_csgo.smx] leffff<392><STEAM_1:0:161121249><> doesn't have paid  CSGO.
L 12/07/2018 - 21:39:06: [free2bekicked_csgo.smx] kainka<394><STEAM_1:0:2650248><> doesn't have paid  CSGO.
L 12/07/2018 - 21:39:43: [free2bekicked_csgo.smx] MEDIC<395><STEAM_1:0:109952789><> doesn't have paid  CSGO.
L 12/07/2018 - 21:40:38: [free2bekicked_csgo.smx] noox<397><STEAM_1:0:61841774><> doesn't have paid  CSGO.
L 12/07/2018 - 21:40:59: [free2bekicked_csgo.smx] bastian.<396><STEAM_1:1:100593746><> doesn't have paid  CSGO.

All of those players have paid version.

I'm gonna check appid 54029 soon.Checked. Still false positives.