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MalteB,
Sorry for the inconvenience. Can you clarify if you are behind a proxy? Can you go to Window > Preference > General > Network Connections and set up your proxy details?
My network settings should be fine, because all other updates of other plugins or even 8.6 components were downloaded fine. Just the mentioned one fails.
So, for the 8.6 update about 360MB need to be downloaded, where 300MB are fine just the 60MB for the spring2 component do fail with the above message.