CCDC Software and macOS

We are pleased to confirm that the CSD Portfolio is now supported on macOS 14 Sonoma, 15 Sequoia and 26 Tahoe.

We are unfortunately unable to support the MacBook Neo as of the 2026.2 release - we are working on this.

For the 2026.1.1 patch release and later releases we have worked to develop Universal Binary builds of our software to better support macOS users on more modern Mac systems with M-series (ARM) chips. Universal Binaries allow our desktop software to run natively on both Intel and M-series Macs, improving performance on M-series Macs where we previously used Rosetta translation.

For the 2026.2 release we now provide both ARM and Intel binaries for ConQuest so that it runs natively on both architectures without the need for Rosetta translation. For more on the phasing out of Rosetta please see

I do not want to use Rosetta emulation on macOS, what version of the CSD software allows this?

To obtain the latest version, please download and use the full CSD installer. Links for this can be obtained via https://www.ccdc.cam.ac.uk/support-and-resources/csdsdownloads/

Known Issues

Unable to compare powder patterns on macOS or Linux with different wavelength to the default

There is a known bug on MacOS and Linux for the PXRD Match and Optimise features. When a reference file is read in with a wavelength different to the default wavelength value, the wavelength in settings is not updated. This results in a dialog stating “Unable to compare powder patterns…”. If the wavelength in the file is very close to the default value in Mercury, an option is to edit the file to make it exactly the same, typically in the header for .xy or .xye files.

Unable to run the CCDC maintenance tool on macOS 15

For installations carried out with the 2024.2 and earlier versions of the CSD installer, you will get the error message ‘The application “ccdc-maintenance-tool.app” can’t be opened' when attempting to run the CCDC Maintenance Tool on macOS 15. This is due to macOS 15 introducing new requirements to allow applications to run.

We have resolved these issues, but as upgrades are not possible with existing installs you will need to re-install again using the CSD Portfolio installer to obtain the latest version that will allow you to apply future updates normally.

Use of ConQuest’s 3D Visualiser on Retina Displays

On macOS systems with retina displays only, there is a known issue with being unable to select atoms in ConQuest’s 3D visualiser. We would recommend exporting your hits to Mercury for further analysis instead.

ConQuest is not compatible with dark mode in macOS

ConQuest will not change its display in macOS dark mode but will instead use the same display as found in standard display mode.

On macOS, ConQuest may occasionally not display interface elements correctly

On macOS, ConQuest may sometimes open an interface panel and not properly render all of its elements correctly. If this happens, closing and re-opening the element should resolve the issue.

Transferring search results from ConQuest to Mercury seems to fail

As ConQuest is older software, we have more work to do before it can be transferred to a Universal Binary. Consequently, the first time that you transfer search results to Mercury from ConQuest via Visualise Structures or Analyse Data, nothing appears to happen (after around 5 minutes you’ll find that Mercury opens with your results). This should only happen the first time that you do the transfer, and subsequent transfers should be much faster.

Labels in images saved from Mercury on macOS may be too large

Labels in jpg or png files saved from Mercury on macOS may be too large - this issue is sometimes resolved by the use of an external monitor.