Use Templates and Addins...Organizer to copy the macros and styles into
your new normal.dot file.
The new version of Word might have its normal.dot file in a different
format, thus causing problems if you replace it with the old one.
(this is assuming the new version has the same commands as prior
versions)

If you have trouble copying the styles and macros over manually, you can use
File Open to open your old normal.dot and then Save As normal.dotm in the
same directory. (you'll probably have to overwrite your new one).

I don't recommend it, as there are new settings in the new Normal that you
might want.  But the option is there if you need it.