As of Xara Plus versions 23+, Xara has decided to remove the option of Download All.
Instead, "In v23 and later all content is automatically downloaded to the Designs Gallery, except for the stock photo and illustration library and the Symbols."

https://helpandsupport.xara.com/xara...t_catalog.html

This might explain your phantom broadband usage of around 3GB.

Acorn