Upgrading to sketch version 4 for RPICT v3
RPICT unit version 3 do not have auto-reset feature and as a consequence it is not possible to upload the sketch directly from the Raspberry pi.
Nevertheless installing version 4 of the firmware is still possible.
One should acquire an Arduino UNO first. These are very cheap on most marketplace. Even clone ones can be used.
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The first step is to remove the microcontroller on the RPICT board. For this use a flat screw driver and gently lift it up from its base. Then place the microcontroller on the arduino UNO.
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Install the Arduino IDE on your computer. https://www.arduino.cc/en/software
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Install the RPICTlib. You can download it form the link below. http://lechacal.com/RPICT/RPICTlib/RPICTlib_v1.4.1.zip
In teh IDE got to Sketch -> Include Library -> Add .ZIP Library. Then select the zip downloaded before.