Not possible to install addon via zip on XBMC Eden

Hi all,  I have an issue with installing a plugin (xStream) to my XBMC Eden Beta on ATV2. Always get the error that the zip file that I want to install via “Install zip file” has not the right structure. The plugin was working on Dharma…so did the required structure for add ons change in Eden? Why isn’t it possible for me to install the zip…have read a lot of posts in other forums and they were able to install the same file I am using. Thanks a lot for your support and a Happy New Year!! Cheers Markus