USB-to-I2C update procedure
If you are currently using firmware version 1.7 or earlier, then you should be using software version 2.9.0.5. You can upgrade to the latest software, but you must first uninstall the USB-to-I2C software and then do a full installation of the new software. A firmware update to v1.8 can be accomplished by returning your microcontroller to us for an upgrade at no charge to you or by ordering a new micro.

May 13, 2007: USB-to-I2C Version 3.4 Full Installation (6.8MB)
If you have firmware version 1.7 or earlier, please uninstall USB-to-I2C before installing this software
Click here to download the update.

May 13, 2007: USB-to-I2C Version 3.4
Important: use for firmware version v1.8 and later
Note that you do not have to download this update if you are connected to the internet when running the application. USB-to-I2C has a built-in update feature so manual updating is not necessary.
Click here to download the update.

December 10, 2006: LPT-to-I2C SE Professional Version 3.1.2
You can also try using the web update feature built into LPT-to-I2C SE rather than manually downloading this file.
Click here to download the update.

May 24, 2005: USB-to-SPI V2 released
USB-to-SPI is now included in the USB-to-I2C package. For those who have previously purchased USB-to-I2C, download the new software for free! Note that firmware v1.3 is required to use this software.
Click here to download the software.