Here's what I did to get this installed. I still haven't tested it yet but it seems to be installed. After you copy the key you need to delete the "nagento-" part. So it reads community/PepMaq_Epsilon. Insert that into the Magento Connect extension manager. Then you'll get some error. I can't remember now. You'll need to change a core file ...EAV/Model/Entity from 30 to 60 in Attributes.php then you'll have to delete the maintenanceflag file to get back into your store. I know this isn't the best explanation but if you Google some of this stuff you should be able to figure it. Now let's go see if I can wade through the Japanese manual and get this thing to work.
Thanks to the developer for making this module. So far it looks like it will really be helpful.
September 4, 2012
I installed this on a Magento ver. 22.214.171.124 through magento connect and it SEEMS to work at first glance, can you confirm it works for this version??
June 9, 2011