forticlient vpn only problem

Hello,

I might not be the first one to ask this question.

When i try to install forticlient vpn only (last version), the file extract on the computer, and then, a small windows popup et hide. The installation doesn't continue, no message.

I am on win11, i try to execute as administrator, no particular firewall. How can i find why the installation is not working?

Thanks you,