How to update internal prices/data for existing calculator?

You only need to upload again your updated file at the first configuration step. From that same moment, calculations will use the new file in order to get results.

If you also need to introduce any visual change to your calculator layout (for ex, you have changed any static text, added some background or new style, or need to insert any new input or output to the form), you will also need to click the 'rebuild layout' button at the editor page. Before using this option, we strongly suggest you previously add nameranges to your input cells, this way all configuration will be preserved even if you move/add new rows to your form.