I have download the .qdz file of Stratix V device and tried to install it. But the Device Installer shows that its already installed. But when I am trying to open an example of Stratix V device, Quartus says the device is not installed. I am not able to install the device and use the example project. Attached the screenshot indicating the same. Please help.
When you create a new project with the New Project Wizard, what device options do you have? Also, double check that the .qdz version you've downloaded matches the version of Quartus that you are using (looks like base 17.1). If it still doesn't work, easiest thing would be to uninstall and reinstall Quartus and the devices along with it.