Answer

PROBLEM

Installation / upgrade / uninstall of GFI Archiver fails and the process is rolling back. The installation log (%temp%\marc*.log) lists the following error right before the rollback is triggered:
 

ENVIRONMENT

• GFI Archiver
• All supported environments

SOLUTION

After confirming this situation consult with a Product Specialist in regard of the solution below. Development might need to be involved to create such a modified installer, as this is not generally available.

1. The installer package must be modified to bypass the CreateAppPoolFunction
2. Perform the installation / upgrade / uninstall
3. Manually create the application pools / web applications in IIS

CAUSE

Windows DLL files are corrupted, which are required for the installer code which handles the application pools in IIS.