$\newcommand{\Dev}{\operatorname{Dev}}$ $\newcommand{\dev}{\operatorname{dev}}$ $\newcommand{\grad}{\operatorname{grad}}$ $\newcommand{\divg}{\operatorname{div}}$ $\newcommand{\Ei}{\operatorname{Ei}}$ $\newcommand{\tr}{\operatorname{tr}}$

First, we'll add the FEBio installation folder to the PATH variable. Open the Control Panel from the Start menu. Switch to Classic View and double-click the System icon. In the dialog box that appears, select the Advanced tab and click the button named Environment variables. Find the path variable and click the Edit button. At the end of the PATH's value (don't delete the current value) type a semi-colon and then the absolute path to the FEBio installation folder (e.g. C:/Program Files/FEBio/). Then click the OK-button on all open dialog boxes.