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Environment/Versions TTworkbench 32/64 Bit, Microsoft Windows/Linux Answer Java JDK or JRE version 8 or greater. Using a 64bit System: We recommend to install Java 64bit and TTworkbench 64bit. Using a 32bit System: You have to insall Java 32bit and TTworkbench 32bit. Notes: Since TTworkbench 28 Release, a 64-bit JVM is required (no support for 32-bit JVM) Java 14 support since TTworkbench 30 release (Integrated OpenJDK 14 (only for Windows)) Java 13 support since TTworkbench 29 release (Integrated OpenJDK 13 (only for Windows)) Java 12 support since TTworkbench 28 release (Integrated OpenJDK 12 (only for Windows)) Java 11 support since TTworkbench 27 release Java JDK includes JRE Additional information: If you have more then one Java installed, you have to check which Java is set in your Enviornment variable Path (e.g.: "C:\Program Files\Java\jdk1.8.0_66\bin";) Otherwise, please close TTworkbench and modify the ttworkbench.ini file (located in TTworkbench installation directory) with any text editor by inserting a "-vm" option BEFORE the "-vmargs" option. The line with the -vm option must point to your JDK bin directory e.g.: -vm C:\Program Files\Java\jdk1.8.0_66\bin -vmargs -Xmx2048m Afterwards, save the ttworkbench.ini file and start TTworkbench.