60327: Acronis Cyber Backup: installation fails with "Error 0x176001e: The certificate trust verification of file 'AB64.msi' has failed"

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Installation of Acronis Cyber Backup fails with:

Error 0x176001e: The certificate trust verification of file 'C:\Users\jamills.ZRN\AppData\Local\Temp\BE51A51A-EE39-449F-A298-4DD493BC8B7F\AB64.msi' has failed.
line: 0x7176e1c64226e49c
file: k:\7641\enterprise\installer\installer_files\impl\certificates.cpp:78
function: 'anonymous-namespace'::VerifyTrust
$module: ab_installer_vsa64_s_7641

error 0xfff0: A certificate chain could not be built to a trusted root authority
line: 0xbd28fdbd64edb8f1
file: k:\7641\core\common\error.cpp:307
function: Common::Error::AddWindowsError
code: 0x800b010a
$module: ab_installer_vsa64_s_7641


A required root certificate is missing in your system. This might happen if you have not installed Windows updates for a long time and the required certificated has not been added to the system, or if the certificate has been deleted manually.


On Windows Vista and later, turn on automatic update of root certificates (at least temporarily for the update time) and reattempt installation.

To turn on Root Certificate update:

  1. Start -> in search, type gpedit.msc and press Enter.
  2. Under Local Computer Policy, expand Administrative Templates and click System.
  3. Click Internet Communication Management. Then click Internet Communication Settings.
  4. Locate Turn off Automatic Root Certificates Update and click Edit policy setting.
  5. Select Enabled and save changes.
  6. Reattempt Acronis Cyber Backup installation.

Installation should run successfully now.


If the affected machine is not connected to the Internet or the Turn off Automatic Root Certificate Update policy cannot be changed, install the Root3 - VeriSign Class 3 Public Primary Certification Authority - G5 certificate (you can find a certificate description here) manually:

1. Download the certificate. Right-click this link and select Save link as.

2. Add the certificate to your system:

    1. Click Start. In search, type mmc and press Enter.
    2. On the File menu, click Add/Remove Snap-in.
    3. Under Available snap-ins, click Certificates, and then click Add.
    4. Under This snap-in will always manage certificates for, select Computer account, and then click Next.
    5. Click Local computer, and click Finish.
    6. In the console tree, double-click Certificates.
    7. Right-click the Trusted Root Certification Authorities store.
    8. Click All Tasks, and then click Import to import the certificate.
    9. In File to Import, specify the path to the certificate downloaded in Step 1, or click Browse and select the file.
    10. Click Next, and then click Finish.

3. Reattempt Acronis Cyber Backup installation.

Installation should run successfully now.