If you need to change it back to metric units system, go to the Plug-in root file of Karamba - Program File: Rhino 5 - (whatever bit) - Plug-ins - Karamba… and change the configuration file (after this download) back to SI (Metric).
If using Imperial Units (ie: inches, feet, etc.) select Imperial Units during the download. The expiration date is unlimited, so it may be worth the purchase. For the purpose of analyzing the entire tower in this tutorial, a Pro-version may be needed.
(all amounts of beam elements and shell elements as well as other features are unlimited). The Pro-Student version will include more components that you will need for extensive analysis.
