I have the same problem. I went through the upgrade process at Dataviz, recieved an email with a download link (which redirected to Ovi), and downloaded the software to my N900. When I attempted to install, it began the install process, then gave me an "unable to install DocstoGo" error. I deleted the viewer version, restarted my phone, and tried again, with the same result. Anyone have any advice? Thanks