I use IE. When logged into Austpost the top bar where they check all your required functions it shows my plugins as RED colour, all the rest are green, this is apparently Adobe Acrobat Reader, so then tried to install and gets to about 75% of installation and then get another error message, :

Error 1328: Error applying patch to file C:\Config. MSI\PT42E.tmp. It has probaly been updated by other means, and can no longer be modified by this patch. For more info contact your patch vendor.  

Question- who is my patch vendor...what does that mean? 

I am hoping this is a simple fix??? thanks