I looked at your website and pressed all buttons which link to your PDF files located in your http://www.mindsupplies.com/docs folder, all downloaded quickly.
For example;
► http://www.mindsupplies.com/docs/TAG...scriptions.pdf

As you are only linking to these files which already exist on your site in a location not touched by Xara Designer and as Xara Designer is not actually publishing (uploading) these PDF files, there is no evidence that Xara Designer or a recent upgrade is connected in any way to the issues you are having.
As mentioned, the files download quickly here.

I would suggest shutting down all open programs and restarting your computer then try again with each browser you have installed on your computer.