Why is Intel® Arria® 10 Part 3 missing from the devices list in the Intel® Quartus® II software installation?

Due to a problem in the Quartus® II software version 15.0, you may see the following warning even though Intel® Arria® 10 Part 3 is not a selectable option.

Arria 10 Part 1 requires Arria 10 Part 2, Arria 10 Part 3. Please make sure the required components are selected.

This problem occurs when the Intel® Arria® 10 Part 3 Quartus II Device file (.qdz) has been unzipped into a different folder from the Intel® Arria® 10 Part 1 and Arria® 10 Part 2 .qdz files.

To work around this problem, ensure all 3 Intel® Arria® 10 .qdz files are in the same folder.

This problem is fixed in Intel® Quartus® II software 15.1.