The latest version is 3.0.
You can see the version by going to the device
Settings, then scroll down until you find
SecureLine, select it, and there you should have some details.
If you see "Negotiation with VPN failed", try these steps:
1. Kill the app
2. Open it again
3. Go to settings (button on the upper-right corner)
4. Tap "Reinstall VPN Profile"
Let me know if it works.