Setup of vpn configuration fails on windows 10

Hi,

I hope I didn't oversee that this was already posted this issue by somone else.

PC: Windows 10/ 64, local admin

1. Installation of FortiClient 6.0.0 was working fine and sucessfull.

2. Starting FortiClient and 

3. Setup VPN Setting

4. Input the Connection Name (See left)

5. press Save, and a error message is shown (See right)    

6. after this Message Forticlients hangs up,

7. when restarting FortiClient, the Name of the Setting are know - but nothing else.

8. a remote session is not startable (because of no server config)

What I tried so far:

- re-installation ==> no effect

- cleaning registry and re-installation ==> no effect

- asking an admin ==> no answer

Does anyone can give me an hint what else I might try?

rgds Holm.