VPN Client issue

Hello,

we have an issue about forticlient application,

1. installed application
2. imported configuration file successfully
3. while entering username and password and click connect button, app does not do nothing, just clearing username and password

also, tried to uninstall, clean reinstall of application with revo uninstaller pro, but didn't work, also trierd to debug on firewall and there was no any traffic matching.

application version is 7.4.3.4726

We tried the same installer file and the same vpn configuration file on other desktop and it worked successfully, the main thing is that we can not reinstall windows but need to setup the forticlient vpn urgently.