Can't import asset from AssetStore

I created a new project and tried to import an asset. It says: Nothing to import, all assets from this package are already in your project, and gives a error: Failed to import package with error: Couldn’t decompress package
But it was a empty project, the asset was clearly not imported.

I could import assets before I upgraded my unity to 2018.2.10f1

I tried to change the project folder, project name, but nothing works so far. Sometimes it doesn’t give error, just says nothing to import.

it seems the Asset that I downloaded was damaged. I deleted the downloaded asset and download again and import. Problem solved.