I am using Unity3D 4.3.1 Pro. There is a bug with importing assets from the Asset Store. I created a new project, launched Asset Store, and import this package: https://www.assetstore.unity3d.com/#/content/9555 I expect the downloaded version to be 18.104.22.168 as written in the Asset Store, but instead it downloaded 22.214.171.124. The Package Contents as shown on the Asset Store does not match what is downloaded. Note that Redownload and Import yields the same problem. Anyone else have this problem? EDIT: Two other people in my team updated their Unity version to 4.3.1 and did not have this problem. EDIT 2: Found a workaround. I had to rename my Unity folder in /Applications. Then do a fresh Unity 4.3.1 install. The bug appears to exist if I install over an existing installation of Unity; it was either (Unity 3.5.0 or Unity 4.3 Beta). This bug probably applies to all packages and not just mine. So, it might be worth looking into since a bunch of people will likely upgrade Unity 4.3.1.