Error: Could not load file or assembly

Grasshopper can load plugins in two ways, and the sequence of decisions that lead to either of these is very complicated, although the default is to load from disk. You can tell by looking at the plugin details once Grasshopper has started. Open up the About dialog, click on the little plus icon in the top left corner, double-click on your plugin icon and look at the loading details.

Other question, is the pdf dll file unblocked in Windows?

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