The alternative strategy is to download all the files associated with the assignments to your computer and then install the relevant software packages. Your “missing module” error is simply that the notebooks themselves are not sufficient: each one is accompanied by a tree of other files. It turns out to be easy to download all the files for a given assignment, but getting all the required software installed and avoiding “versionitis” problems is not quite so easy. There are no official instructions for that, but here is a thread that will get you started down that path. Some problem solving skills will be required on your part, but if you’re going to be playing this game on a long term basis, the sooner you start developing (or further strengthening as the case may be) those skills the happier you will be.