When upgrading FortiClient version 7.2.2.0864 to FortiClient 7.2.3.0929 you can encounter problems where the installation will fail with msi Error 1723.

The error is the msi 1723 error.

Error 1723. There is a problem with this Windows Installer package. A DLL required for this install to complete could not be run. Contact your support personnel or package vendor. Action CA_InstallFCTServices, entry: MSI_InstallFCService, library: C:\Windows\Installer\MSIFAAA.tmp

The solution is really simple but can be quite frustrating to troubleshoot. The error relates to either a problem with the Windows Installer service or a specific DLL and permissions to the DLL on installation. If you follow one of the possible solutions below the installation will then be successful.

Possible Solutions to Error 1723.

Possible Solution 1

• Windows Installer version 3.0 is missing from the client pc. Download it from Microsoft site.

Possible Solution 2

1. Turn off Anti-Virus during installation
2. Try to login with different Windows user profile.
3. Go into c:\users\”username”\AppData\Local
4. Right click on “temp” and choose “properties“.
5. Choose “security” –> edit –> add, and add the username you are using
6.  Give yourself all rights.
7. Apply and Ok

Possible Solution 3

• As a work around you may also try to follow the steps provided below, which would help you to unregister and re-register Windows installer.

1. On the “Start” menu, Type Run in the search bar and hit enter.
2. In the “Open” box, type “msiexec /unreg”, and then press ENTER.
3. On the “Start” menu, Type” Run” in the search bar and hit enter.
4. In the “Open” box, type “msiexec /regserver”, and then press ENTER.

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