ermm.... slight problem O_O
Click the File Paths button, beside the Python box, one of the buttons says 'Re-evaluate scripts registration in menus': Click it. This will cause the PyPRP options to appear in File->Import and File->Export. You are now ready to create your own Ages!
That's from the site you gave us.
well, after a lot of point-and-click Myst-style searching, I found those buttons.
Then I went up to File, but there was no Import and File tab...
and Export's tab didn't have Python or PyPRP as one of the things inside it... did I do something wrong?