Somewhere along the line you must have removed the setup.msi involved with the setup file for Eyefi Mobi Cloud. I can see notifications in the Event logs, but nothing that screams error - just completion messages with end code 0 - nothing to point me in any direction. In talking with them they have seen this before, and other than 'getting lucky' with some of the steps above have not found any reproducible way to resolve this issue. Download special versions they built currently 3.4.29.0 of Mobi_Setup.Run the 'MicrosoftProgram_Install_and_' application to resolve install issues.Had me Clear all registry entries and folders.I've contacted Eye-Fi support and have worked with them for (not kidding) the last several months (dialog at bottom). I'm running Windows 10 64 bit with all the latest patches. This seems to be related to the Windows C++ Redistributable package, but I have installed other applications before and after this with no issues. It's a window that pops up, the text below is in the box and you can scroll up and down, but you can only hit 'OK', and then the install just ends. When I attempt to install it begins and then ends with a 'error'. However the application that downloads JPG, RAW and MOV from the Site to my PC will not install. I can get the images from my Camera to my Android, and from there they upload to the Eye-Fi site with no issues.