Official release of the XPS Annotator portable has never been done, but you can create XPS Annotator become portable with the help of your own. How is it?
The trick is very easy, when you install XPS Annotator on your system, there are four kinds of files stored on your computer, the files are: license.txt, unins000.DAT, unins000.exe, and XpsAnnotator.exe.
To make XPS Annotator become portable, you simply take the XpsAnnotator.exe from Program files and put it elsewhere (i.e. your flashdisk), try to open the XPS Annotator in other computer.