March 23, 2017: CASA 4.7.2 is now available.

Obtaining the CASA Release

Supported Operating Systems

The latest CASA release 4.7.2 is available for the following operating systems:

  • Linux
    • Red Hat 7
    • Red Hat 6
  • Mac OS X
    • OS X 10.11 (El Capitan; 64-bit)
    • OS X 10.10 (Yosemite; 64-bit)
CASA may also work on other flavors of Linux. The list above covers those operating systems that we run regular tests on.

CASA-based Pipelines

ALMA and VLA pipelines are updated regularly and included in some versions of CASA. In the download section below, the latest official pipeline releases are available that are being used for production at the observatories.


Please follow these links for downloading the code for your specific operating system. Installation instructions are provided, too.
CASA Pre-releases are code under development. Use with caution as the code is still undergoing changes, is less tested and not well documented.

Package sizes vary between 0.4-1.1GB.

CASA Pipelines
CASA Release
CASA Pre-releases
Linux Packages Installation
Red Hat 7
Red Hat 6
Mac OS X Packages Installation
OS X 10.12 (Sierra)
OS X 10.11 (El Capitan)
OS X 10.10 (Yosemite)

OS X users should be aware that it may be necessary to temporarily bypass Apple's Gatekeeper security system in order to run CASA for the first time after downloading it. This can be accomplished by using "Ctrl+click" on the downloaded application file and selecting "Open" from the contextual menu. More details may be found here.

Older Releases

RedHat 7
RedHat 6 (CASA 4.3.0+)
RedHat 5 (CASA 4.3.0+)
RedHat (CASA <=4.2.2)

MacOS 10.11
MacOS 10.10
MacOS 10.9
MacOS 10.8 (4.3+) OSX 10.8 (<=4.2.2)
MacOS 10.7
MacOS 10.6
MacOS 10.5


CASA User Reference & Cookbook (current release): Download (pdf)
Source Code: Source Code Notes
If you need additional help, please consult our NRAO helpdesk or ALMA helpdesk
Staff  |   Policies  |   Diversity