I've looked through many similar threads which seem to range from changing settings to changing https to http to attempting to install manually.
Trying to install ADT 20.0.0 on Eclipse 4.2 Juno gives me this error.
All items apart from Android Developer Tools install with no issue, although when including download.eclipse.org/releases/juno/ on the software sites I get frozen at this stage for a while (Note: it's been stuck there for about 5 minutes currently), then proceeds to give the earlier error.
The problems are the same whether using archive/local/link and extracting the items and running with -clean didn't change anything either.
Is there anything else I could try to fix this?