Does your PHP version in Joomlas System > System Information > PHP Information specifically say 7.0.6-1? I'm not finding any official release information regarding the -1 notation on the version. I've upgraded to 7.0.6 and still am unable to confirm your issue.
Is there another PHP 7 release available to you that you could try? Please also check that cURL is available.
If still having issues try making the below change as a last resort to see if issue resolves.
IN: libraries/CBLib/GuzzleHttp/Adapter/StreamAdapter.php
ON: Line 62
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The following user(s) said Thank You: edmundcheong, mafiaxxx