I tried to install GOG Galaxy 2.0 on Lutris but downloading "wine-lutris-6.0-rc1-x86_64.tar.xz is incredibly slow.
My loading tab shows 3477:20:28 hours remaining.
I have an 100Mbit Internet connection.
If someone is interested, I managed to download the file thanks to JDownloader and extracted it to “/home/$USER$/.local/share/lutris/runners/wine”
Lutris will then recognise the Folder as installed runner.
Maybe someone here also having trouble downloading runners in Lutris you can go this way.