I’ve got a 768k DSL line but routinely average 2/3’s of the top speed as I live in a (seriously) underserved area of
Just downloaded the (93mb) Launcher/Installer and when I run I get the small window stating ‘Please Wait…’ for abut 3-5m before the launcher opens up…
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Make sure to post this on answerhub -> https://answers.unrealengine/ 
Also make sure to take a look at this thread: