Install without Sample data

As it's posted by developer Start upgrade after release of 1.1.8.4
Upgrade process provided in following link doesn't delete piwik tables. So we dont provide upgrade until we get proper upgrade process or confirmation from developer.
http://blog.tomatocart.com/tutorials/tomatocart-v1-1-8-1-to-v1-1-8-4-upgrade-guide.html