I just replaced the original v1.0.0 Pygments for WL Writer installer with a new and improved v1.0.1. The original URL still works – I archived the old version off with a new name. Updated source is available on on GitHub.
The only change is that I now override OnSelectedContentChanged in the sidebar control. That way, if I have multiple blocks of pygmented code in a given post, the sidebar UI updates with the correct language and color scheme of the currently selected code block.