That’s a known problem in MacOS Serria. Please try the workaround under Yosemite. Maybe that’s the same issue.
The workaround to access the asset store when using mac OS Sierra is to drop the tab to a single window. Than you can see the asset store. Unity or Sierra don’t support to display the asset store in the tab (embedded window).
okay so the way i got around it was to install unity via windows on my parallels virtual machine… im now able to access the assets store… sadly this isnt a solve everyone can make use of, but it worked for me.
Thanks for taking the time to get back to me guys.