Hamachi sometimes doesn't work. Recenly I had several cases when I couldn't connect to hamachi-network for 1 hour or more.
I suggest to use alternative program called Leaf. It's easy and simple as Hamachi. You can download it HERE
After installation is complete:
- create user ID
- create room
- invite another user with his ID
- disable Hamachi adapter (in Network connections)
- setup VPN as described HERE
- restart PC if you don't have external IP address