Error downloading UE 4.25.1

hi, I want to give faceAR demo file a go (to do something similar) and I have UE 4.21.2.
The demo file is for UE 4.24 and higher, but the only available new release is 4.25.1 and keeps giving me errors trying to download the installer. The installation consequentially doesn’t work.
I have a brand new Windows tower workstation, so the specs are not an issue.
thank you,