Same Problem. PLN Update from AC20 to AC21 doesn´t work. I can´t use our template as well...
I haven´t installed the new Test-Version for AC21, I have only the 126.96.36.199.
Win 10 | ArchiCAD GER 20-21 | Octane Plugin for ArchiCAD
13 Licenses | Network Render over 12 graphic cards (1080, 1070, 980 Ti, 980, 970)