Have you installed some devices with your Quartus installation? You must download separate device files.
Make sure you've downloaded the MAX 10 devices file.
Thanks for your response ,
yes.. installed max10-184.108.40.206.qdz with quartus prime 16.0. listed all MAX10 devices except 10M50DAF484I6G device.
attached the screenshot of listed device.
As mentioned in device datasheet –I6 &-A6 speed grades Intel MAX 10 FPGA devices are not available by default in Quartus tool.
To support further we require some details(like location information, full name, company address and contact number) so Intel personnel will contact you privately.