Windows10, NVivo 12 Plus (version 12.5.0.815 64-bit). I open NVivo and it says that an update for 12.6 has been downloaded and is waiting for installation. I select Install Now, and it goes through a process to try and install. This then opens a cmd window. Over the cmd window, a loading box displays and closes. Then closes the cmd window. Then a Preparing to install window opens. the progress bar progresses. It closes, but nothing happens. When I open a NVivo project, it (again) asks if i want to upgrade to the new version 12.6. I have tried this by launching NVivo as both a standard user and as an admin user, neither works. i have also tried this with NVivo not running, and with NVivo running. This doesn't change the outcome. I have restarted my computer and still this does not work. I want the upgrade. I do not want to uninstall NVivo, so won't upgrade if this is required.