Cannot install ISO SBC for Raspberry Pi

[Allen_Miller]

Using the ISO downloaded from the Partner Website Nov 15 2021 https://customer.3cx.com/prm/downloads.aspx (v18) https://downloads-global.3cx.com/downloads/debian10iso/debian-amd64-netinst-3cx.iso
I format my 32g SD card FAT and used latest version of Etcher to flash the image to card.
When this card is no longer readable from my windows workstation - giving an error message that card/volume needs to be formatted.
When I boot it from my RPi 4 it starts to load and gives error message Unable to read partition as FAT (screen shot https://photos.app.goo.gl/guuykmtBnksttu7t8
I have downloaded the iso multiple times, on 2 different computers. I have used 2 different computers Etcher app to create memory card. I have used 2 different RPi 4's.
Am I the only one having this problem?
Regards,
Allen

 

[Charles_3CX]

You're actually downloading the ISO for the Linux version you actually need the IMG file for the Pi, as per this guide https://www.3cx.com/docs/installing-pbx-raspberry-pi/.