FortiClient SSL VPN Install Rollback

I've been trying to install the SSL VPN Only forticlient install on an employee's workstation and the install process gets almost all the way finished but then errors out and rolls back. There is no actual error message listed in the installer. I can see the MSIexec logs in windows starting the install and ending it but there are no errors there either. There also doesn't appear to be a log file created locally by the installer in the software or app data directories.

I've tried multiple versions of the offline install from fortinet's downloads page as well as the default auto installer. I noticed that after a failed install the registry creates a "Fortinet>Volatile" entry under local computer with a "requires reboot" value of 1 but even after a reboot the install just fails again. Removing the Fortinet registry value does not change the outcome either.

As a work around I installed the full forticlient with only the required install components and the SSL VPN. This installed successfully and I verified the user was able to connect to VPN but it's prompting a warning that after a month free trial VPN won't be available so unless the SSL VPN functions at a basic level after the trial it is not a long-term solution.