I am attempting to add the fuzzy lookup add-in for Excel but I keep receiving an error message

The error message says:

The solution cannot be installed because it is signed by a publisher whom you have not yet chosen to trust. If you trust the publisher, add the certificate to the Trusted publisher list.

Name:FuzzyLookupAddInForExcel - Microsoft Fuzzy Lookup Add-In For Excel

From:file:///C:/Users/veteran/AppData/Local/Apps/Microsoft/Fuzzy Lookup Add-in for Excel/Bin/FuzzyLookupAddInForExcel.vsto

*************Exception Text*****************

System.Security.SecurityException: The solution cannot be installed because it is signed by a publisher whom you have not yet chosen to trust. If you trust the publisher, add the certificate to the trusted publisher list.

at

Microsoft.VisualStudio.Tools.Office.Runtime.Office AddInDeploymentManager.VerifyAddInTrust(ClickOnceAddInTrustEvidence evidence)

at

Microsoft.VisualStudio.Tools.Applications.Deployment.ClickOnceAddInDeploymentManager.VerifySecurity(ActivationContext context, Uri manifest, AddInInstallationStatusinstallState)

at

Microsoft.VisualStudio.Tools.Applications.Deployment..ClickOnceAddInDeploymentManager.InstallAddIn()

The zone of assembly that failed was:

MyComputer