If you download a package for the first time, the green download bar shows 100%.
But if you click import, nothing happens.
You need to close the asset store window and re-open it again in order to be able to import the package.
I seen this happen on non beta versions also, asset store page also slow, real slow… and not most best user friendly, not sure what the packages at the top all about.
Yeah it happens in regular versions too.