Java is natively blocked from web browsers.  You may need to manually perform the following steps on each device attempting to run java programs such as the Colorado Phet simulations.

  1. Click the download button on the simulation page.
  2. In the bottom left corner of the browser click Keep:

  3. In the same location the simulation file will appear, click it to open it:

    Java may pop up with some warnings:

  4. If the message Java version out of date appears – click Later:

  5. You should now see the simulation being downloaded:

  6. If the message Do you want to run this application appears – click the checkbox [Do not show this again] and click run:

  7. The simulation will now start:

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