Try downloading again, and unpack everything again.
There are many files in the package, and if one important of them is missing, it can lead to the error you are describing.
Also remember the maximum length of a file path. (I think it is 259 characters) And if you are close to that length (C:/folder/folder/folder/file.zip) and then unpacking, and it makes a new folder with everything in, it can result in problems writing some filenames, and they are then skipped.
So try again, move it as close to the disk's root as possible, then unpack again.