Impossible to download Maps with Garmin Express on Garmin Edge 540 Solar

Hi,

I wanted to download and install TopoActive Eastern Europe map on my Garmin Edge 540 Solar from Garmin Express on my Mac Tahoe 26.5.2.
I already had Garmin Cycle MAP EU 2022.11, Central and Garmin Cycle MAP EU 2022.11, West installed on my device since I brought the device.
After accepting the terms and conditions, the download does not start and displays the following windows : 

I also tried on a Win laptop. The download starts, but after about 5%, it stops with the following message:
"Some changes not applied."

I deleted the old maps so the Garmin has approximately the full storage free. I have also tried different cables. My Mac has also a lot of free storage.

So how can I fix the problem? 
Really need some help, i'm on a northern Europe trip and have now no map at all on the Garmin.