hi
i got it to work in the end – i activated another theme, then reactivated twenty twelve and it prompted me to download that specific plugin. i’m not sure how or why that worked. it’s working now, although safari doesn’t seem to like the plugin a lot, might use it in chrome from now on (my version of safari is old, it might be that).
the site is https://www.huus57.com, i customized twenty twelve to my taste, but there isn’t much on it yet.
thanks for your reply!