At Tracker Software, the further development of PDF-XChange Viewer has already been stopped for a few years in favor of their PDF-XChange Editor ...https://www.tracker-software.com/produc ... nge-editor
So, if you like, download and install this last one, and give it a try. All its features are fully functional.
A lot of these features are "free" to use. For the "pro" features, you must have a license.
In case if you are going to use one of its "pro" features (while not having a license for it), you will get a warning message.
If you continue, the Editor will put publicity stamps on the PDF-pages.