Error 1720 Installing Cisco VPN Client on Windows 7, 64 bit

Can't complete installation of a VPN Client on my computer - get the following message: "Error 1720. There is a problem with this Windows Installer package. A script required for this install to complete could not be run. Contact your support personnel or package vendor." I was able to install the software on another computer (also Windows 7 / 64-bit) no problem, so the problem must be with Microsoft, not the software itself. These are several things I have tried:

- Changing the start-up type of the Windows Installer to "manual"
- Right-clicking and running the downloaded file as an administrator
- Rebooting before doing the above

I believe the client requires Windows Installer 5? - Not really sure about this, but the downloaded .exe file is named "vpnclient-winx64-msi-" Other people in this forum have recommended going to the microsoft downloads site and downloading Windows Installer 4.5, but I don't think that'd work in this instance.


Any other potential solutions?

Question Info

Last updated March 23, 2020 Views 15,936 Applies to:



Cisco VPN Client is not compatible with Windows 7 64 bit.


Step 1: Try installing it in compatibility mode

Make older programs run in this version of Windows”:

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