I've pinged Geertjan who's the Netbeans product lead, hopefully he'll jump on here an answer your Q soon.
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Geertjan has said to email him directly: geertjan DOT wielenga AT oracle DOT com
Thank you, I have emailed Geertjan
Thanks. Trying to find out where that NBM file is, sent you a mail in response. It is conceivable that NetBeans IDE 8.1 doesn't support that version anymore.
This old plugin does work with NetBeans 8.1. My previous laptop has still got Netbeans 8.1 working with this plugin. I want to download the .nbm file again to install it on a new laptop.
You might try downloading the plugin here:
It installs and works fine in NetBeans IDE 8.1.
Hope this helps,
NetBeans Community Manager