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The problem may be that IIS is not serving Static Content, which you can set up here: If your still having issues, try to  set the identity of the anonymous user to the App Pool Identity on IIS as shown below.

Below are the 3 solutions you can do to resolve the Cisco VPN client 5.0.07.0440 for x64 5.0.07.0410 and x86

Here's an easier and faster way to do it. Just:   1 - Open search, type Powershell and open it  2 - copy/paste the following command  New-ItemProperty -Path HKCU:\SOFTWARE\Microsoft\Windows\CurrentVersion\Themes\Personalize -Name AppsUseLightTheme -Value 0 3 - Press enter. Done. If you want to undo, just copy/paste Remove-ItemProperty -Path HKCU:\SOFTWARE\Microsoft\Windows\CurrentVersion\Themes\Personalize -Name AppsUseLightTheme