message: Use new UE zip.
  This one doesn't include Linux support, and doesn't include the Engine
  source.
diff: @@ -5,7 +5,7 @@ then
  compact //c "//s:C:\Program Files\Epic Games"
  mkdir "C:\Program Files (x86)\Epic Games"
  compact //c "//s:C:\Program Files (x86)\Epic Games"
  - AWS_ACCESS_KEY_ID=${GOOGLE_ACCESS_KEY_ID} AWS_SECRET_ACCESS_KEY=${GOOGLE_SECRET_ACCESS_KEY} aws s3 --endpoint-url https://storage.googleapis.com cp s3://cesium-unreal-engine/windows-2021-05-07/UE_4.26.zip .
  + AWS_ACCESS_KEY_ID=${GOOGLE_ACCESS_KEY_ID} AWS_SECRET_ACCESS_KEY=${GOOGLE_SECRET_ACCESS_KEY} aws s3 --endpoint-url https://storage.googleapis.com cp s3://cesium-unreal-engine/windows-2021-05-19/UE_4.26.zip .
  7z x UE_4.26.zip "-oC:\Program Files\Epic Games"
  rm UE_4.26.zip
  AWS_ACCESS_KEY_ID=${GOOGLE_ACCESS_KEY_ID} AWS_SECRET_ACCESS_KEY=${GOOGLE_SECRET_ACCESS_KEY} aws s3 --endpoint-url https://storage.googleapis.com cp s3://cesium-unreal-engine/windows-2021-05-07/Launcher.zip .
  