EPM - Firmware download failed

Good afternoon. Hopefully you can help.

I have purchased and installed the End Point Management module, and I am trying to download the latest firmware.

So I followed the instructions, selecting the applicable firmware versions and dragging it into the Firmware slots. When I click on submit, i get the following error in red:
" Firmware download failed.
Please resubmit to try again."

it does not matter what firmware I try or brand. they all fail.
I am currently running PBX Firmware: 6.13.66-1

Hoping you will be able to help.

Were you ever able to find a resolution to this? Having a similar issue.