ATS 25 Max Decoder WIFI on no option to upgrade firmware

[rhsmith]

Hello,
I have a new ATS25 Max Decoder running firmware version 4.17 AIR beta. I have Wifi working fine and can receive FT8, There is no option in the setup to upgrade the firmware. I would like to upgrade to 4.2. The licence key is filled in and appears valid.
What am I missing? I do not have a PC I use a MAC. Any ideas?
73
Robin

[dua]

You need a computer with windows 10 and above