Error on installation: System deployment or location not trusted error

In certain installs the below error message may appear:

“Customized functionality in this application will not work because the certificate used to sign the deployment manifest for CRE Suite Excel Add-In or its location is not trusted. Contact your administrator for further assistance.”

Generally, this error occurs when attempting to run an install with an anti-virus software that does not allow ClickOnce installations. The CRE Suite utilizes the ClickOnce installer for our desktop applications.

In most cases, running a clean install using the instructions found here will allow the user to properly install the application.

In rare cases this may not be enough. Certain computers may not have the ClickOnce trust prompt configured. After the above clean install has been attempted, follow the below instructions:

  1. Perform steps 1-6 AGAIN for the clean instal. It’s important not to skip this. Clean Ribbon install steps

  2. Configure the computer to allow the ClickOnce Prompt. Instructions below have been adapted from Microsoft Support here.

  1. Open the registry editor:
  2. Click Start , and then click Run .
  3. In the Open box, type regedit (or regedit32 on 32-bit Windows), and then click OK .
  4. Find the following registry key:\HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT.NETFramework\Security\TrustManager\PromptingLevelIf the key does not exist, create it.
  5. Add the following subkeys as String Value , if they do not already exist, with the associated values shown in the following table. If they do exist, right click the subkey and select “Modify” and change the respective values from “Disabled” to “Enabled”
String Value subkey Value
Internet Enabled
UntrustedSites Disabled
MyComputer Enabled
LocalIntranet Enabled
TrustedSites Enabled

For Office solutions, Internet has the default value AuthenticodeRequired and UntrustedSites has the value Disabled . For all others, Internet has the default value Enabled .

  1. When the above steps are completed, the registry should look like this

  2. Disable any anti virus, reboot if necessary

  3. Open Google chrome, navigate to and log in.

  4. Click “Download” and select the application you are looking to install.

  5. Run the newly downloaded setup.exe