Mesa 7i96s pkuart firmware

Hi,
I'm new to LinuxCNC. I tried to build a small milling machine and would like to control the VFD driver through Modbus.
I am using the Mesa 7i96s. I’ve seen some people mention flashing the card with "7i96sd_pktv2.bin" to remap the SSerial port to the PKUART port, but I can’t find this firmware.So, I’m stuck at the beginning…
Maybe I’m misunderstanding something?
Can you help me?Thanks!

If you got to Mesa's web store and then to the specification tab for the 7I96S
there is a support software download selection. 

This support software includes firmware files for the 7I96S

Thank you

It’s obvious now, but since I bought it in the EU, I couldn’t find it…