The plugin for the version 2.40 works with version 2.50?
There is no guarantee that the plugin will work with the latest changes of nopCommerce 2.5 from Codeplex web site.
When nopCommerce 2.5 is officialy out we will release an updated version of the plugin for nopCommerce 2.5.
But in the mean time if you want to try the plugin with nopCommerce 2.5 then you can use version 2.4 of the plugin. You might need to change the supported version in the Description.txt file at some point to 2.50 in order to install the plugin.
Nop-Templates Support Team