Chromeleon License File [new] [No Ads]

A Chromeleon license file (.cmlic) is a small data file used by the Thermo Scientific Chromeleon Chromatography Data System (CDS) to authorize software use and enable specific purchased features. Core Content & Function

While the file is a binary/encoded data format rather than a standard text document you write yourself, it contains the following critical information:

Serial Number: A unique identifier (e.g., xxxxxx) that must match your physical USB license key (dongle).

Software Version: Specifies which version of Chromeleon (e.g., 7.2 or 7.3) the license is valid for.

Purchased Options: Activates specific software features such as: 3D data acquisition. Number of allowed client connections. Number of instrument controllers. Compliance features (Audit trails, etc.). Typical File Details Naming Convention: Chromeleon7_[SerialNumber].cmlic.

Standard Location: C:\ProgramData\Dionex\Chromeleon\ (This is a hidden folder by default). How to Obtain the File

You generally do not "write" this content. Instead, it is generated or transferred through these methods: chromeleon license file

From a Dongle: When you plug in a new light blue Chromeleon 7 USB dongle, the license file is often automatically transferred to your computer.

Online Activation: In newer versions (Chromeleon 7.3+), you can use dongle-free activation where you enter a License Initialization Code (LIC) to download the file directly from Thermo Fisher servers.

Technical Support: If you lose your file, you can contact Thermo Fisher support with your dongle's serial number to request a replacement .cmlic file. Licensing Codes (Management)

If you are managing licenses in the Administration Console, you will likely deal with these codes rather than the raw file content:

LIC (Initialization Code): Provided with your purchase to start the process.

LRC (Request Code): Generated by your PC to identify the installation. A Chromeleon license file (

LAC (Activation Code): The final code provided by Thermo Fisher to unlock the features.

Are you trying to recover a lost file or activate a new instrument for the first time?

Use a new Chromeleon 7.2 dongle that contains a license file

Where is the Chromeleon License File Located?

Knowing the default file paths is non-negotiable for troubleshooting. The location depends on your version and operating system.

For Chromeleon 7.x (Server-based installation):

For the License Manager Tool:

Important: The ProgramData folder is hidden by default in Windows. You must enable "View hidden items" in File Explorer to navigate there.

How to Obtain a Chromeleon License File

You cannot create a license file yourself. It must be generated by Thermo Fisher’s licensing portal based on your purchase order. Follow this standard workflow:

  1. Generate a Host ID: Run the Chromeleon License Manager on the target server. Copy the generated Host ID (a string of alphanumeric characters).
  2. Request a License: Provide the Host ID to your Thermo Fisher sales representative or enter it into the Thermo Fisher Self-Service Licensing Portal.
  3. Receive the File: Thermo will email you a Chromeleon.lic file (usually as a .txt or .lic attachment). Do not open it in Notepad and resave it—this often corrupts the encoding.
  4. Save the File: Place the file in the exact directory specified above.

How the License File Works (Floating Model)

  1. License Server – A dedicated Windows or Linux machine runs the license daemon (e.g., lmgrd + thermo.lic).
  2. Client connections – Any Chromeleon client (instrument PC, data processing station) requests a license from the server over TCP/IP.
  3. Check-out/Check-in – When you start an acquisition or processing session, a license token is checked out; closing the session returns it to the pool.

Without a valid license file accessible to the server, Chromeleon will either fail to launch or run in a severely restricted “viewer-only” mode.

For Legacy Chromeleon 6.x (eLPN)

Old installations often stored licenses here:

C:\Chromeleon\Data\System\
C:\Program Files\Chromeleon\Shared\

Step-by-Step Guide to Installing a Chromeleon License File

Deploying the license file incorrectly is the #1 cause of "License Not Found" errors. Follow this protocol precisely:

1. Check the "License Recovery" Folder

Chromeleon often creates a backup. Look in: C:\Program Files\Thermo\Chromeleon\License\backup\ or C:\ProgramData\Thermo\Chromeleon\License\ For the License Manager Tool: