The B-Fabric Download Manager requires Java Web Start (javaws) to run the JNLP (Java Network Launching Protocol) file that B-Fabric generates for the download. Until Java Version 8, javaws was part of the Java installation. With Java 9, javaws was deprecated. So, please make sure that javaws is installed on your computer. You might use Java Iced-Tea-Web or for Windows the Fabric Download Manager Helper below, which is pre-packed executable that includes javaws.

Java Iced-Tea-Web

• Java Download Manager needs Iced-Tea-Web with any version of Java: Install and Download IcedTea-Web

B-Fabric Download Manager Helper

• BFabric Download for Windows 64bit

MacOS

• Java Securitty Settings for MacOS

Links

• Java - all releases of Oracle Java are only allowed for "personal use". ETHZ and UZH are not seen as "personal use" by Oracle.
• Free and OpenSource Java (OpenJDK) versions:
  • ZuluJDK - OpenJDK from Azul
  • Adoptium JDK - Eclipse Temurin JDK
  • Coretto JDK - Amazon JDK
  • Microsoft OpenJDK
  • ojdkbuild - OpenJDK for Windows
• Iced Tea Web