2. Can I install SuperSU from some place other than Google Play?
1) I don't know how to help you out. Try a full reset or try to flash a new stock firmware with Flashtool
2) I guess you didn't get the point. If towelroot can't write its stuff into the system, then supersu can't work properly. That's the problem
EDIT: before any reset, uninstall your towelroot and try a previous version like this one: towelroot v2
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