For pre-built Linux versions, the file comes in two parts. Download both parts.

• topas_3_9.zip is the source code, for those who want to build from source.

• topas_3_9_osx11_7.zip is pre-built for MacOS 11.7 and newer

• topas_3_9_debian9.tar.gz is pre-built for Debian 9 and 10 and Ubuntu 18, 19 and 20.

• topas_3_9_centos7.tar.gz is pre-built for CentOS 7 and RHEL 7 

• topas_3_9_centos8.tar.gz is pre-built for CentOS 8 and RHEL 8.

• An external user has been kind enough to share their own CentOS9 build. This can be found through their offering in the TOPAS User Forum.

See the User Guides link on the left menu for further instructions.

For access to additional resources, we invite you to join the TOPAS User and Development Community. Membership is free of charge. Membership includes access to our discussion group, the TOPAS User Forum, and the option to participate as a developer in our TOPAS GitHub environment. See the Registration link on the left menu.