I've not been able to update TrelloExport frequently lately, but still it is alive!
Last updates are:
Version 1.9.71 adds new columns (checklist items' due date, assignee and status) to checklists' mode excel export
TrelloExport 1.9.72 re-introduces the capability to load templates-sets from external URLs.
Your feedback is always welcome. If you have any problem please open an issue on GitHub, I'll do my best to fix it quickly.
If you wish to support the development of this tool, like Richard did (thanks again!), you can make a donation.
You can now get TrelloExport from the Chrome Web Store at this URL.
If you want the source version, get them on GitHub at https://github.com/trapias/trelloExport, and follow the installation instructions in the readme.