Windows 10: "vsto certificate used to sign the deployment manifest is not trusted"

Discus and support "vsto certificate used to sign the deployment manifest is not trusted" in Windows 10 Software and Apps to solve the problem; I'm trying to install the freeware add-in "XLToolbox" into Microsoft Excel 365. But when I try to install it, I get the error message "Customized... Discussion in 'Windows 10 Software and Apps' started by Eksy61, Jan 5, 2019.

  1. Eksy61 Win User

    "vsto certificate used to sign the deployment manifest is not trusted"


    I'm trying to install the freeware add-in "XLToolbox" into Microsoft Excel 365. But when I try to install it, I get the error message

    "Customized functionality in this application will not work because the certificate used to sign the deployment manifest for XLToolbox or its location is not trusted. Contact your administrator for further assistance."

    It's got an XLToolboxforExcel.vsto file, so I guess that's where the issue is.

    Is there any workaround to fool or force Microsoft Excel to install this add-in?

    :)
     
    Eksy61, Jan 5, 2019
    #1

  2. Customized functionality in This application will not work because the certificate used to sign the deployment manifest for TranslitGT or its location is not trusted

    Can not install as add on MS Office 2013:

    System.Security.SecurityException: Customized functionality in this application will not work because the certificate used to sign the deployment manifest for TranslitGT or its location is not trusted. Contact your administrator for further assistance.
     
    ZoranRadovanović, Jan 5, 2019
    #2
  3. N8 certificates not trusted/don't match the name

    Well I worked out for myself how to verify the certificates are genuine:

    • Using a desktop computer
    • Go to the page with the certificates
    • Select a certificate
    • It will say either:
      • Certificate already exists - this confirms that the certificate on the website matches one already in your browser, which we already trust, therefore the certificate on the website is trustworthy
      • Asks if you want to install the certificate, DON'T.
        • First view the certificate details.
        • Copy the certificate serial number or SHA1/SHA256/MD5/etc hash
        • Paste this into a search engine
        • If another website that you trust lists the certificate, e.g. your phone manufacturer or another trusted website (preferably a secure website, therefore you have confidence the website is genuine), then you can trust the certificate
        • If no trustworthy sites are returned in the search then try another hash or serial number
        • If you can't find any trustworthy sites listing the certificate then I suggest you don't trust it.
    • Finally, if you decide you trust a certificate then you can download and install on your phone.
     
    CurvyClover488, Jan 5, 2019
    #3
  4. jeanie77 Win User

    "vsto certificate used to sign the deployment manifest is not trusted"

    Open .vsto from IE11

    I would like to install a VSTO Office Add-in by opening the deployment manifest from an IIS website, as explained

    here
    .

    I'm currently using IE11 on a Windows 10 pc.

    The install process fails, because IE11 doesn't give the option to directly open .vsto file: it only allows to save and then open. In this way, paths to manifest and other resources gets invalid, since they aren't referred to the original http url, but relative
    to the Download folder.

    Switching to Edge does solve the issue: the file is opened from the original location and the required files are correctly downloaded and installed.

    How can I configure IE11 to Open .vsto file instead of Save? I noticed that 'Open' is not even an option, how to unhide this menu item?
     
    jeanie77, Jan 5, 2019
    #4
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"vsto certificate used to sign the deployment manifest is not trusted"

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