Fatal error while installing RMT tool

When installing Tableau Resource Monitoring Tool, the installation fails with:

Error 0x80070643: Failed to execute MSI package. See log snippets for more.

Cause

• The specific group policy object "Turn on Script Execution", located in Computer Configuration/Administrative Templates/Windows Components/Windows PowerShell, is set to "Allow only signed scripts"
• The installPostgres.ps1 script bundled within the RMT installer isn't signed. Instead, we run with the flag -ExecutionPolicy Bypass
• The "Turn on Script Execution" policy setting exists under both "Computer Configuration" and "User Configuration" in the Local Group Policy Editor. "Computer Configuration" has precedence over "User Configuration". On this machine the User Configuration setting hasn't been set--but even if it were, the "Winning GPO" is the Computer Configuration one. This GPO prevents the user from running anything unsigned, and ignores the -ExecutionPolicy Bypass flag we use to run installPostgres.ps1