New SD Card image maker from Raspberrypi.org
https://downloads.raspberrypi.org/imager/imager_1.4.exe
(Choose Custom OS)
Also See:
https://www.raspberrypi.org/downloads/
Latest build that supports Pi 4 with 8G ram.
(Also works with all other Pi 3 and 4 versions)
RTX-05-2020-09-12:
https://remotetx.s3-us-west-1.amazonaws.com/rtx05-2020-09-12-raspios-buster-lite-2020-08-20.zip