Downloading & Installing

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The current User's Guide is very much a work in progress, any help would be greatly appreciated!
If you'd like to contribute something, just hit the 'Edit' tab at the top.


OpenRocket is available for Windows, macOS and Linux. The easiest way to get OpenRocket is to download and install one of the packaged installers. The Packaged Installers for OpenRocket come with everything they need. You don't need to install, update or downgrade Java on your machine to run them.


OpenRocket 15.03 Installer for Windows

Download the installer, run it to install OpenRocket, much like other Windows installers.


OpenRocket 15.03 Application DiskImage for macOS

Download the DiskImage, open it, and you'll see a big icon for OpenRocket, and a shortcut to your Application folder. Drag OpenRocket to the Application Folder, let it finish copying, and you're done.


OpenRocket 15.03 AppImage for Linux

You will need to have the FUSE filesystem installed; most distributions have it installed by default. Download the AppImage file, make it executable and you can run it by double-clicking, or from the command line.

Java "jar" file[edit]

OpenRocket 15.03 requires Java Version 6 or better to run (but does not run with Java versions greater than Java Version 8).

At this writing (Mar 2021) these versions of Java are very old.

The easiest path is to skip the jar installation, and instead use the packaged installers for your platform, until an updated release of OpenRocket is available.

Java "jar" version - not recommended at this time[edit]

  1. Download the OpenRocket application.
  2. Copy it to a convenient folder.
  3. Make the .jar file executable (right-click on .jar file, select "Properties", go to the Permissions tab and check the "Allow executing file as program" box).
  4. Start OpenRocket by either double-clicking the .jar file, or right-clicking the .jar file, and selecting "Open with Sun Java6 Runtime".

If the default is set to open with the Archive Manager, then right-click, select "Open with other application", then select "Open with Sun Java6 Runtime", and check the box to make that the default. In future, it should be possible to just double-click to start OpenRocket.

Alternatively you may start OpenRocket from the command line:

java -jar OpenRocket-15.03.jar

Or, if you are not currently in the same directory as the .jar file, replace '/path/to/' by the appropriate path on your system:

java -jar /path/to/OpenRocket-15.03.jar

Linux Users[edit]


The AppImage is the preferred way to obtain OpenRocket for Linux at this time, as OpenRocket 15.03 requires an old version of Java (Java 8) which is not installed by default in most distributions.

Ubuntu/Debian Repository[edit]

Note that if you install OpenRocket from a repository as in the following instructions, it will likely not work since it requires an older version of Java than is commonly distributed today. Our next release is targeting newer versions of Java, and hopefully this will become a useful approach to installing again at that time.

If you are running a recent version of Ubuntu or Debian, then OpenRocket can be easily installed using the Ubuntu Software Center or Synaptic (etc.). Please note that the version in the distribution repository may not be the latest version. Alternatively you may install OpenRocket from the command line:

sudo apt-get install openrocket


sudo apt install openrocket

To start OpenRocket, simply select it from the Applications menu.

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