VERIFIED SOLUTION i

Resolve warning message "failed to launch help file" during the installation of Spectrum Spatial Analyst 12.1

Issue

During the installation of Spectrum Spatial Analyst 12.1 the following warning occurs:

User-added image

Cause

There is no PDF reader on the installation machine.

Resolution

UPDATED: March 9, 2018
You will be able to clear the error by installing a PDF reader. In up coming releases a more meaningful error message will be generated by the installer to let the user know that a PDF reader is not installed on machine. 
Environment Details
Product Feature: Spectrum Spatial Analyst