SecureAuth Updater hangs on a blank CMD window with no progress

SecureAuth IdP Version Affected:  9.1+

Description:  

During an IdP upgrade the updater appears to have hung with a blank CMD window.  A Powershell thread can be seen running in task manager but is not doing much:

Running the updater again and quickly taking a screenshot it is possible to see an error about a missing "clear" method:

Cause:  

The CMD line window is running a Powershell script called PFXConvert.ps1 which contains command that uses a clear() method (e.g. $permarray.clear()). 

Powershell v3 or higher is required for this.

Resolution: 

Upgrade Powershell to version 3 or higher on the IdP being upgraded.

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