Luca came to the rescue and got the store installed.  We will play with it for a few days, and if we can make it do what we want, we may finally have a winner!

The problem was a couple of dlls (eBay and SaferPay) need Full Trust to work and this cause the error. If you delete them from the bin folder, the module works ok, but you can not use the ebay and SaferPay features anymore. Also he had problems because he started the installation wrongly and he continued in that way. He moved in a Full Trust hosting, I uninstalled the module and installed it again and now everything works OK, actually he seems very happy now. I must say, since the size of the module is huge some hosting can not cope using the stantand installation using the uploading of the PA (which works ok in the localhost). Now I 've just released a new version which makes this possible for that kind of hosting and easy to do at the same time, for more information about that see this article: http://www.sysdatanet.com/sysdatanet/dotnetnuke/GuidedTour/gt1A.aspx