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This isn't the correct venue for offering support, but did you enable the system plugin and follow the instructions listed above?
There really isn't much to this component + plugin duo. You just need to be sure to enable the system plugin.
The shop has a few issues, but those could be sorted out with the quick and helpful support of the author.
I think the idea of having a plugin that snaps products to articles is very efficient and a very reliable way to integrate the shop into an existing content structure. Very well done.

