I attempted to edit the .INI file
There was and is no reason at all to change the ini file manually. Simply making a change in the settings through the GUI will do the job.
I then uninstalled an reinstalled AVAST with the Mail Shield feature
There was no need to uninstall avast. You could have added the mail shield through control panel.
Not to mention the fact that 'auto-update' was removed for existing subscribers
auto-update has never been removed.