Applies to Java 7, 8, and later

Note: The Mars Calendar software is not a security risk. Java is giving you a general notice to take software only from safe sources.

1. Go under Windows Start Button (in the bottom left of the screen), All Programs, find Java on the list and then click "Configure Java." This will open the Java Control Panel.
Can't find it?

2. Go under the Security tab and then click Edit Site List.
Press Add. Enter:
Can't find it?

3. Click Ok and Continue on the security dialog box. Now go back to the Mars Calendar page or press this link and try the download again.

These instructions have been adapted from: