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Do you have enough disk space for entire download? If that’s not problem, you may have a network connectivity issue that is blocking you. View this link to try solutions: #The_Launcher_is_unable_to_download_content
If it doesn’t help, collect your Launcher logs (steps provided at bottom of wiki page), and make a post on Installation & Setup section of Answerhub.
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Thank you for your support!Now I can download engine normally.(Maybe my network is poor yesterday)
By way,(I have also verified that refraction does not work correctly on Android or devices. I have submitted a Jira for this as well, which can be referenced as: UE-21001.)it seems that refraction on metal still doesn’t work in 4.9.2.And gpu particles still not being implemented in metal.Will them be fixed in 4.10?Thanks very much!