This website is hosted with Microsoft Office 365. As per their policy, viewing of pdf files in-browser is not allowed.
Kindly enable Java Script
on your browser to view files in browser.
Alternately, from the URL above, please extract the direct download link - ie.
1. Delete the following after www.crosstree.info, " /Documents/pdf.aspx?file= "
2. You will be left with www.crosstree.info/Documents/the_document_filename.pdf
Use this as input URL and you should be able to download the pdf file.
Apologies for the bother!