Chromeleon License File [1000+ SIMPLE]

Demystifying the Chromeleon License File: A Guide to Installation, Recovery, and Best Practices

If you have ever administered a laboratory running Thermo Fisher’s Chromeleon Chromatography Data System (CDS), you have probably encountered the phrase “License File” and felt a small chill run down your spine.

Unlike the "good old days" of physical dongles (though those still exist), modern Chromeleon versions (7.2, 7.3, and the new 7.3.2) rely heavily on a combination of a license file and a license server. When that file goes missing, gets corrupted, or is accidentally moved, your entire chromatography workflow can grind to a halt.

In this post, we are going to dig deep into what the Chromeleon license file actually is, where to find it, how to install it, and—most importantly—how to rescue your lab when things go wrong. chromeleon license file

1. Single Server (Standalone)

One computer acts as both the server and the client. The license file lives on that machine. If you reformat the PC without backing up the file, you lose the license.

Error 2: "License File Expired"

Symptom: Chromeleon launches but enters "Viewer Mode" or "Demo Mode" and will not acquire data. Demystifying the Chromeleon License File: A Guide to

Cause: An evaluation license has expired, or a maintenance plan has lapsed.

Fix: Purchase a renewed maintenance agreement. Thermo will issue a new .lic file with a later expiration date. Install it over the old one (the system will automatically overwrite). Add the line: BORROW 720 (borrow for 720 hours)

3. Hardware Dongle (The Old Guard)

Some legacy systems or specific high-security installations use a USB hardware dongle. Interestingly, the software still looks for a virtual license file that references that dongle.

License Borrowing for Citrix/RDS

If you use Remote Desktop Services (RDS) or Citrix, concurrent users count against your license pool. To avoid "license storms," configure the Chromeleon.lic file to allow borrowing:

  • Add the line: BORROW 720 (borrow for 720 hours).
  • Users must manually File > Borrow License before disconnecting.

2. Regular Backups

Automate a daily backup of the C:\ProgramData\Thermo\Chromeleon\ folder to a secured network location or cloud (e.g., Veeam, Azure Backup). Why? If your server RAID fails, restoring Chromeleon without a matching key file will require a full re-installation and license re-host from Thermo (which can take 24-48 hours).

Before You Upgrade:

  1. Deactivate (not delete) your old license via the License Manager.
  2. Save the deactivation receipt (a .txt file with confirmation codes).
  3. Uninstall the old version.