Importing large assets broken?

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1

Currently on Unity 5.3.3, win10 and every time I want to import a new large asset I have problems with the in-built asset store. I select download and after a little too long the asset downloads, or so it looks like (green, 100%) but then I press import and nothing happens and there is no indication that anything is happening - after a bit I press import again and again but nothing happens.
Clicking the download button seems to re-start the download.
Eventually I close the asset store window and re-open it - finally I can import the asset.

Known bug or fixed in newer Unity?

2

I get this all the time, size of the asset doesn’t matter. Pressing “import” after the download has finished, and the little tooltip thing appears at the top saying so, does nothing, I have to close the asset store window and reopen to import.

Had this on 5.3.4 and still now on 5.3.5