Use the following procedure to open an existing model.
Note: When you open a Stella model that was created in Stella or iThink version 10.x, it's translated automatically, but may need adjustment to work correctly. See Using Version 10 Models.
From the File menu, choose Open, or press CTRL+O (Windows) or ⌘+O (Mac).
Note: If you're opening a model created with an earlier of Stella or iThink, a message will appear that tells you the model is being converted to a newer format. Click OK to convert the model.
To open a .stm or .itm (from old Stella and iThink software) please contact support.
If you already have a model open in the Stella window, a message will appear that asks you if you want to save changes to the currently open model.
Select whether or not you want to save changes to the currently open model.
The Open dialog box will open.
Click Open.
The model you chose will open in the Stella window.