When installing 2017.4 WebPACK, not all WebPACK devices listed in the 2017.4 Vivado Release Notes (UG973) are available to select for designs.
How do I select and use these devices for WebPACK?
In order to use these devices, the following steps need to be taken:
1) Upgrade to Design Edition or System Edition via "Add Design Tools or Devices".
This will download the necessary device files for these parts.
2) Update to 2017.4.1 (available on the Downloads page). This will provide the necessary license to use the devices.