Repairing Registration in UCSF Chimera

Registration from Chimera versions prior to 1.5.2 uses a public-key certificate that expired in January 2011. The certificate expiration causes all of those registrations to be treated as expired, and makes attempts to re-register fail. The simplest fix is to upgrade to Chimera 1.5.2 or newer.

If, however, you wish to keep your installed version of Chimera, you can fix the problem manually by installing two new files: and These files should replace files of the same name in folder CHIMERA_INSTALL_LOCATION/share/chimera on Linux and Windows, and in on Mac OS X.

For your convenience, we also provide fixreg.chimerax, which, when opened in Chimera, will update the two Python files mentioned above without your having to know the exact installation location of Chimera. To apply fixreg.chimerax, take the following steps:

  1. From your browser, click fixreg.chimerax and save it to a file on disk. Please make sure that the file has the .chimerax extension so that Chimera will recognize the file type.
  2. Start Chimera. If you are on Windows, particularly Vista or Windows 7, you will probably need administrator privileges. The easiest way is to right-click on your Chimera icon and select Run as administrator.
  3. From Chimera, select File -> Open... from the menu bar and open the fixreg.chimerax file that you saved in the first step.
  4. There are several possible outcomes:
    Update completed.
    You are good to go. You can re-register your copy of Chimera at this point, or do so later.
    Update was already installed.
    The update has been applied previously.
    You do not have permission to update Chimera.
    You must rerun Chimera as a user with write permission to the installed Chimera location.
    Update does not apply to this version of Chimera.
    You do not need this update because you have a post-1.5.2 version of Chimera.
    Error dialog pops up.
    Something unexpected happened. Please bring up the bug report, add your e-mail address, and submit it.