Thank you for your continued support; I reviewed each of the plugins, and in all buy one case, I located the mentioned files in the folder "obj/Debug" or "obj/Release" foders... I created a folder using the same folder name the plugin was decompressed in (ie Nop.Plugin.Widgets.GooglePlus) or also (ie Widgets.GooglePlus) and now I do not recieve an error, but when i restart the website or reload the plugin list, nothing new appears and no new plugins need to be installed.
I've tried to load the solution in VS2010-Ultimate and then "Build" it, but even then I recieve errors, such as:
The type or namespace name 'Web' does not exist in the namespace 'Nop' (are you missing an assembly reference?)
I have made simple point-of-sale/customer management database apps in VB, but have not used C# before; and I am not certain if there is a specific way of opening the solution before it can be compiled or not... I don't know if I need to have the full source copy of nopcommerce installed in any certain fashion first... I set up my local nopcommerce site using Microsoft WebMatrix.
Perhaps you can give me, possibly, one last bit of advise before I need to contact the author of each of the plugins.