No, you don't need to upgrade.

Are you talking about two different documents, or two pages in the
same document?

For the case of two documents, you have a choice: do you want two
completely separate Word windows, each with its own menus and
toolbars, or do you want both documents in the same Word window? The
only difference is to go into Tools > Options and check or uncheck the
"Windows in Taskbar" option -- if it's checked, each document will be
in a separate window; if it's unchecked, they're in the same window.
Use the Window > Arrange All menu item to display them.

For two pages, if they're consecutive, just use the Zoom dropdown --
at the bottom of the list is "Two pages". If they're not together, use
the Window > Split command, click in the middle of the screen to
position the split bar, and use the two separate scroll bars to locate
your two pages in the two panes. When you're done, click Window >
Remove Split (or just drag the split bar all the way to the top or
bottom).

--
Regards,
Jay Freedman
Microsoft Word MVP         FAQ: http://word.mvps.org