Limit New Cards to Less Than One
As add-ons are programs downloaded from the internet, they are potentially malicious. You should only download add-ons you trust.
This add-on previously supported Anki 2.0. You can download the last version supporting 2.0 here. As Anki 2.0 has been discontinued, no support is available for this version.
All Anki 2.1.x Add-Ons
[on the top of the page there is still written "for Anki 2.0 only". The "compatibility" section of the description says something similar.
Also (2.0 version): Anki kept saying there was a problem with my syntax until I put a comma after the '7' of the second given example. There is no comma either in the syntax model presented on the download page.
Hope this helps!]