Lucid Builder System Requirements The Lucid Builder requires a Java Runtime Environment (JRE) to be installed before it can be installed or run. The minimum and recommended version is Java SE 11 (LTS). The two main JRE options available to choose from are: OpenJDK – OpenJDK 11 (LTS) – Free, open source Java – (Recommended)https://adoptopenjdk.net/ Oracle – Java SE 11 (LTS) – Commercial licence (personal use free)https://www.oracle.com/java/technologies/javase-downloads.html The Lucid Builder is compatible with the following operating systems: Windows OS Macintosh OS Other unix based operating systems with a JRE installed Note: The Lucid Player only requires a modern web browser* to operate. A JRE is not required for the Lucid Player.