The full process for downloading processed data from VR.World may be found here.
As described in the link above, a small file of type .pulsarvrworld is first downloaded, which allows the NCTech VR.World Download Manager to find the processed data for download. For security reasons, .pulsarvrworld files are only valid for 1 week. If a user attempts to download data using a .pulsarvrworld file that is older than 1 week, then the download will not commence and an "Expired" message will be shown:
In this happens, users must download a fresh copy of the .pulsarvrworld file from VR.World and the download will then run as expected.