Hi Meguido,
Sorry it’s taken a while to get back to you [your log is pretty big ;)].
Looking through it you seem to be getting a lot of “Failed to download chunk” reports, about 101 by my count. The first thing we need to do is work out whether this is an issue with the Launcher or the connection to the internet.
When one of these errors occurs, it also spits out to the log the URL of the chunk it failed to download, e.g.
https://download.epicgames.com/Builds/Rocket/Automated/Reload/CloudDir/ChunksV3/58/47CB81822EA19B97_47EC718A45325AFA58E4178893927376.chunk
These can be pasted into your browser of choice and download there too.
What I recommend trying is: attempt to update the engine version again, and take a look in the log that generates for these reports and randomly try a few of them and number of times in your browser and see if that can download the chunk instead. If the browser fails to download it too, then it might be an issue with your machine, router/modem, or even ISP. If the browser downloads the files fine, then we can start digging further.
Please let us know either way, thanks.
Andrew