How to install and run OpenRocket with as few issues as possible.
OpenRocket is an application that uses Java (Version 6 or later) to run. Mac OS generally comes with Java and will update it automatically. For Windows machines you may have downloaded Java for some other application already. To download the most recent version of Java, click here.
OpenRocket is free to download and is available here. Once at the site, click to download the most recent version. The download should be fairly quick and you can run the file immediately once downloaded, so long as Java is installed.
If you have any issues with running OpenRocket, or just want a slightly easier and improved experience, Neil W.'s post on The Rocketry Forum hopefully has you covered. Read the post for more detailed information, or simply get started in OpenRocket by downloading and running from the links below.
https://www.dropbox.com/s/dfpo0pzztgsscqf/OpenRocket-15.03-installer.exe?dl=0
https://www.dropbox.com/s/33o53vlle5b0uex/OpenRocket-15.03.dmg?dl=0