The Dropbox desktop app installer gives a "failed to start" error

Hi, recently I received a notification indicating that Dropbox needed to be updated and I attempted to update it however I received an error message indicating that the "installer failed to start."  I decided to uninstall Dropbox and did so, apparently successfully, but on attempting the install again I still receive the "failed to start" message.  I've attempted to use the offline installer, have checked the firewall and disabled it for the period of the install.  Same error.  I've read some of the other discussion issues here and have tried various suggestions to no avail.  Is there any logging available from the installer that would tell me where the failure point is?