HPS just released the direct download version of Jena.
Information about purchasing the DD version of Jena can be found here:
http://www.hpssims.com/shopping/shopdisplayproducts.asp?id=40&subcat=40&cat=Napoleonic+Battles (http://www.hpssims.com/shopping/shopdisplayproducts.asp?id=40&subcat=40&cat=Napoleonic+Battles)