[ThatKidWhoGames]

Try this version. Comes with one ConVar:

sm_block_jumpers_enable - Enable/disable the plugin (1 = Enable, 0 = Disable)

PHP Code:

#include <sourcemod>
#include <tf2_stocks>

#define ROCKET_JUMPER_INDEX 237
#define STICKY_JUMPER_INDEX 265

ConVar g_cvEnable = null;

public void OnPluginStart()
{
    g_cvEnable = CreateConVar("sm_block_jumpers_enable", "1", "Enable/disable the plugin", _, true, 0.0, true, 1.0);

    HookEvent("post_inventory_application", Event_PostInventoryApplication);
}

public void Event_PostInventoryApplication(Event hEvent, const char[] sName, bool bDontBroadcast)
{
    RequestFrame(Frame_PostInventoryApplication, hEvent.GetInt("userid"));
}

public void Frame_PostInventoryApplication(any data)
{
    if (g_cvEnable.BoolValue)
    {
        int iClient = GetClientOfUserId(data);
        if (iClient != 0 && IsPlayerAlive(iClient))
        {
            int iPrimary = GetPlayerWeaponSlot(iClient, TFWeaponSlot_Primary);
            if (iPrimary != -1 && GetItemDefinitionIndex(iPrimary) == ROCKET_JUMPER_INDEX)
            {
                TF2_RemoveWeaponSlot(iClient, TFWeaponSlot_Primary);
                EquipFreeWeaponSlot(iClient);
                PrintToChat(iClient, "[SM] The Rocket Jumper is not allowed!");
            }

            int iSecondary = GetPlayerWeaponSlot(iClient, TFWeaponSlot_Secondary);
            if (iSecondary != -1 && GetItemDefinitionIndex(iSecondary) == STICKY_JUMPER_INDEX)
            {
                TF2_RemoveWeaponSlot(iClient, TFWeaponSlot_Secondary);
                EquipFreeWeaponSlot(iClient);
                PrintToChat(iClient, "[SM] The Sticky Jumper is not allowed!");
            }
        }
    }
}

int GetItemDefinitionIndex(int iEntity)
{
    return GetEntProp(iEntity, Prop_Send, "m_iItemDefinitionIndex");
}

void EquipWeapon(int iClient, int iWeapon)
{
    SetEntPropEnt(iClient, Prop_Send, "m_hActiveWeapon", iWeapon);
}

void EquipFreeWeaponSlot(int iClient)
{
    int iWeapon = -1;
    for (int i = TFWeaponSlot_Primary; i <= TFWeaponSlot_Melee; i++)
    {
        iWeapon = GetPlayerWeaponSlot(iClient, i);
        if (iWeapon != -1)
        {
            EquipWeapon(iClient, iWeapon);
            break;
        }
    }
}