Problem solved! Thanks.
When I reinstalled python 3.4.3 again, I ticked the red x to put 3.4 on the path. I had previously not done that, since I had assumed it best not to mess with the default install. Then I was able to install Wheel and Beautiful Soup and now the plugin works.
I used to have python 2.7 on my computer, but uninstalled it when Sigil began using 3.4.
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