Aeon Multisensor 6 - ultravioletIndex?

I am on 1.12...I'm trying to update firmware now. Keeps getting stuck on "padding hex bytes...".

I brought it in the house, removed the batteries and plugged it into a 2 amp USB plug. I am using "Z-Wave Firmware Updater" by djdizzyd from here:

The update URL I am trying is:
https://aeotec.freshdesk.com/helpdesk/attachments/6085201263
From their update page:

When I say "stuck" I mean I gave it a couple hours...gave up, reboot Hubitat and unplugged/re-plugged the 6 sensor and tried again...and it has been sitting at padding hex for some hours again...after quickly saying a bunch of stuff like "download", etc.

Any other good way to update firmware?

Thanks in Advance,
Todd