Good news, everyone!

Xara just responded and gave me a download link to the files. They also said that the templates will no longer be available, so they will not return to Xaratemplates.

The newest Xara files are from 27th April 2022 (Zip file is 771 MB in size), so I highly recommend to everyone who doesn't have a backup of the latest download to ask Xara as soon as possible for a download link.