Software Spectra Support

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TFCalc 3.5.15 Update

This latest update enables designers to compute and optimize diattenuation. It also corrects a problem using Windows Vista 64. For more details about all new features, click here.

Latest Driver

If you plan to use an older version of TFCalc on the Windows 2000, Windows XP, Windows Vista, Windows 7, Windows 8, or Windows 10 operating systems, you may need to download and install a new driver. Click here to download a 1.9 MB ZIP file containing the "Sentinel System Driver Installer v7.5.9".

On some versions of Windows 10, you may need to use "Sentinel System Driver Installer v7.6.0", which is available here.

If you use the USB key, be sure to disconnect it from the computer before you install the driver. After you unzip and run this installer, the latest driver will be installed.

TFCalc for Macintosh

Although we no longer sell a version of TFCalc for Macintosh computers, we have verified that the Windows version of TFCalc works with the new Macs that use the Intel processors. In fact, using software such as Parallels or VMWare Fusion, you can run Macintosh and Windows programs simultaneously. Call or send e-mail for more information.

TFCalc/WDM 1.3 Update

A new version of the TFCalc/WDM software is available. For more details, click here.

Register TFCalc

If you purchased a copy of TFCalc, but you have not returned your TFCalc registration form (found in the front inside cover of the TFCalc manual), we may not know where to send software updates. You may register on-line by clicking here.


If you have a question, please send e-mail to

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