how to add openStudio 2.9 plugin to Sketchup pro 2018

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I believe you have to download Euclid by Big Ladder. I had tried downloading the legacy Openstudio/Sketchup plugin and found it's not compatible with Sketchup 2018.

If you have access to Rhino/Grasshopper I would recommend checking out Ladybug Tools' Honeybee plug-in. It will allow you to build your geometry (and even set up schedules, spaces types, construction types) in RH/GH while assigning parametric values (good for early energy analysis). At the very least you can create geometry and export to Openstudio.

(https://github.com/NREL/OpenStudio/wi...)

Euclid plug-in:

https://bigladdersoftware.com/project...

Honeybee (you'll also need to install Ladybug to run HB):

https://www.ladybug.tools/honeybee.html