It is quite some time since I used PagePlus X3. Using Word 2007 I created a document with a footnote and then opened PagePlus X6 and started a booklet publication. I then went to insert text file and selected my saved document with footnote and it imported correctly with footnote in the right place. The problem that I now have is whether X3 supported that.
Windows 10 Home vs Windows 10 Pro comparison: Here are the extra features you get in the Pro version