Select your version of Mathematica (earlier versions no longer provided):
Sometimes it is possible to use the later version of the Pack within an
earlier version of Mathematica. When you open a notebook of a later
version of the Pack into an earlier version of Mathematica and get
messages that the notebooks (or palettes) have been produced by a later
version of Mathematica than you are using, it often suffices to
click on that warning window. What you might also do, is to save those
particular notebooks again with your own system. Of course, all at your
own risk. It is more complicated with the packages. If the engine changes
much, the controls might not work.
Back to The Economics Pack.
PM. The "End of Line" symbol for users of Unix or Macintosh
Nowadays, this installation uses *.zip files. That should cause no problems
for Unix or Macintosh.
unzip -aa TheEconomicsPack.zip
See here for an explanation.