Modify the Health.cs and the PlayerHealth.cs script to use the new "HP" SyncProperty instead of the protected currentHP variable.

Health.cs

using SWNetwork;
using UnityEngine;

public class Health : MonoBehaviour
{
    public int MaxHp = 100;

    const string HP = "HP";
    public NetworkID networkID;
    public SyncPropertyAgent syncPropertyAgent;

    void Start()
    {
        networkID = GetComponent<NetworkID>();
        syncPropertyAgent = GetComponent<SyncPropertyAgent>();
    }

    public void GotHit(int damage)
    {
        // update the HP SyncProperty when got hit
        int currentHP = syncPropertyAgent.GetPropertyWithName(HP).GetIntValue();

        if (currentHP == 0)
        {
            return;
        }

        currentHP = Mathf.Max(currentHP - damage, 0);


        syncPropertyAgent.Modify(HP, currentHP);
    }

    public void OnHpChanged()
    {
        // handles HP OnValueChange event
        int hp = syncPropertyAgent.GetPropertyWithName(HP).GetIntValue();
        HPUpdated(hp);
    }

    public void OnHpConflict(SWSyncConflict conflict, SWSyncedProperty property)
    {
        // handles HP OnConflict event
        int remotePlayerHp = (int)conflict.remoteValue;

        if (remotePlayerHp != 0)
        {
            int oldLocalPlayerHp = (int)conflict.oldLocalValue;
            int newLocalPlayerHp = (int)conflict.newLocalValue;

            int damage = oldLocalPlayerHp - newLocalPlayerHp;

            remotePlayerHp = remotePlayerHp - damage;

            if (remotePlayerHp < 0)
            {
                remotePlayerHp = 0;
            }
        }

        property.Resolve(remotePlayerHp);
    }

    public void OnHpReady()
    {
        // handles HP OnReady event
        if (networkID.IsMine)
        {
            int hp = syncPropertyAgent.GetPropertyWithName(HP).GetIntValue();

            int version = syncPropertyAgent.GetPropertyWithName(HP).version;

            if(version == 0)
            {
                syncPropertyAgent.Modify(HP, MaxHp);
            }
            else
            {
                HPReady(hp);
            }
        }
    }

    public virtual void HPUpdated(int hp) {

    }

    public virtual void HPReady(int hp)
    {

    }
}