April 2026 Installer Upgrade Flaw - Information and Remediation

Description of the Issue

Application installers for Fathom 14, Arrow 11, Impulse 11, and xStream 4 contained a flaw that prevented successful upgrades of existing installations. The application executable (e.g., Fathom.exe) was not replaced during the upgrade process.

Addressing the issue requires manual intervention.

We apologize for the disruption. Contact our support team at flow-support@datacor.com with any questions.

Scope

This issue strictly affects users who upgraded an existing Fathom 14, Arrow 11, Impulse 11, or xStream 4 installation using installers available on the Customer Portal from April 3, 2026 to April 14, 2026. These installers have since been removed.

There was no impact on application behavior or results. The flaw only affects internal application component identifiers, which prevents further upgrades from completing successfully.

How to Tell if You Are Impacted

You are affected if you ran an installer downloaded between April 3–14, 2026. These installers had modified dates of March 24, 2026 and were named:

  • Fathom14-2026.03.17v14.0.1184-Installer.exe

  • Arrow11-2026.03.17v11.0.1184-Installer.exe

  • Impulse11-2026.03.17v11.0.1184-Installer.exe

  • xStream4-2026.03.17v4.0.1184-Installer.exe

Remediation

If you did not run the affected installers, no action is required.

If you ran an affected installer, a full uninstall is required. This includes running the Windows uninstaller AND manually deleting additional files. Specifically, uninstalling won't properly remove files in the C:\Program Files (x86)\Datacor\Fathom 14 directory, so that directory will need to be manually deleted. That listed directory is an example for Fathom 14, but also applies to Arrow 11 or any other app. Reference the directions here: Full Uninstall

Then, download and run the corrected installer(s) whose file names are appended with "Corrected" in the Customer Portal. Since the actual program executable was not affected or re-built, it is still dated as the 2026.03.17 maintenance release build 1184.

  • Fathom14-2026.03.17v14.0.1184-Installer-Corrected.exe

  • Arrow11-2026.03.17v11.0.1184-Installer-Corrected.exe

  • Impulse11-2026.03.17v11.0.1184-Installer-Corrected.exe

  • xStream4-2026.03.17v4.0.1184-Installer-Corrected.exe