Steve, Xara has only provided a link to a cut back access to Pixabay.

You get better served using https://pixabay.com directly.
All other content is Xara's and downloadable. Well over 3GB.

If you have not used Download All, you lose access to the Online Content Catalogue when your Update Service expires.
You can still use the external Pixabay access.

If you do this all you lose is Xara not providing a Search capability for your downloaded content.

Was it a Pixabay image you were after with the 400 error?

Acorn