Unfortunately the page doesn't help... HVP mode is initiated using the MCLR pin, it needs to be held to a higher than normal voltage (about 12V, depending on the chip). Those designs show how to connect the programmer to the MCLR pin on the chip, but there's no hint of what level the pin outputs from the programmer. Any programmer not running off a real RS232 COM port, will need some kind of circuitry to increase the >5V input, into the needed voltage. There is a big blue cap on that board, which may be a good sign, or could mean nothing at all. Have you emaled them yet? What did they say about HVP?