Cannot install 6.2 after uninstalling 6.0

Hi !

I have uninstalled (with Windows uninstall) my precious version of FortiClient 6.0, everything looks fine, I don't have any Network Adapter with the name "forti" in it.

But when I try to install FortiClient 6.2, I get the error message "Your network administrator has modified FortiClient on this computer. Reboot your computer to continue having network access. Contact your network administrator for details. Do you want to reboot now ?".

Of course, rebooting does not solve this, and I am administrator on my computer.

If I want to reinstall FortiClient 6.0, the installation does a rollback when installing drivers.

How can I install FortiClient (6.0 or 6.2) again on my computer ? Where can I see installation logs to help me solve this ?