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Yep, it's not just you, down here in downunder too.
Here is a site to check if it's down just for you or everyone: http://www.isitdownrightnow.com/sketchup.com.html
or here: https://www.heise.de/netze/tools/webcheck/
503 Service Unavailable: Back-end server is at capacity
Apparently for quite some time.
a screenshot of version 8 doesn't lead to very much trust into this down time info...
Despite the image, the info would appear to be up to date.