I was on with Lacerte support and the issue relates to the tax planner.  The 2018 tax planner is not in the download available.  However, if you have the box checked to download the tax planner (which was automatically checked for me) then you get the message that setup is unable to find the required files.  I went through Websetup again and unchecked the tax planner box and the program appears to be appropriately installing now.