ArchiCAD12 version of the plugin (all platforms) was released together with Maxwell 1.7 - simply download ArchiCAD plugin for Maxwell1.7 and you get v12 support there.
Pavol
- By Forum Moderator
Hello Edward, For the backdrop planes not to bloc[…]
- By Mark Bell
I'm unsure which Maxwell version you're on, if v5,[…]
I should have gess. 
Thank you