Defender ActiveRoles Server Integration Pack installation error, "Error 1720. There is a problem with this Windows Installer package" (4211169)

When installing Defender ActiveRoles Server Integration Pack you may receive an error:

"Error 1720. There is a problem with this Windows Installer package. A script required for this install to complete could not be run. Contact your support personnel or package vendor.   Custom action ADP_runVBSInstall script error -2147211587, : The specified class cannot be found.

Line 2190, Column 33."

The Active Directory Schema has not  been extended.

To extend the Active Directory schema for Defender:

Version 5.7:

Run the Defender Schema Wizard from the "Install" tab of the "autorun.exe".

Version 5.8.x and up:

Select the "Active Directory Preparation" option during the Defender setup to extend the schema.

For more information on Deploying Defender, please refer to the Administration or Quick Start guides available here: Defender - Technical Documentation.