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Latest Driver If you plan to use an older version of TFCalc on the Windows 2000, XP, or Vista operating systems, you may need to download and install a new driver. Click here to download a 1.8 MB ZIP file containing the "Sentinel System driver Installer v7.4.0". 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. If you have installed Windows XP Service Pack 2, you may need to update your driver. Please follow the instructions above. 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 when Virtual PC (version 7) software is installed on your Macintosh. The Windows version also works with the new Macs that use the Intel processors. In either case, you will need the USB hardware key. Call or send e-mail for more information. TFCalc 3.5.11 Update This latest update, limits on the number of data points in files for materials, illuminants, and detectors have been increased to 10001. Also, a few minor problems have been found and corrected in TFCalc 3.5. There is also support for USB dongles. If you already have version 3.5, then you can download the update. For more details, click here. Possible Problem Installing 3.5 TFCalc 3.5 is installed using Windows Installer, which some older versions of Windows do not have. If Windows Installer is not on your computer when you try installing TFCalc 3.5, an error message will be displayed. In this case, install the driver software first (step 5 in the installation instructions that accompanied the update), and then install TFCalc 3.5. TFCalc 3.5 Shipping The new TFCalc 3.5 software is available. For a list of features, click here. 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. Questions? If you have a question, please send e-mail to support@sspectra.com

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