Is it possible the .zip file being output when exporting to the desktop app is being corrupted during export? After multiple attempts to export the data i receive this error despite the zip appearing to have contents.
There was a temporary issue with the .zip file downloaded from Pix4D Cloud between March 23rd and 28th.
Downloading the new .zip file from the cloud page of the project should fix the previous issue.
Apologies for the inconvenience.