Fix exception while extracting package

[BerserkerDotNet]

Fixing a few issues here:

1. Call to ExtractToDirectory fails with an exception:

Exception calling "ExtractToDirectory" with "2" argument(s): "End of Central Directory
record could not be found."

as it expects a directory as a second argument and not a file

2. A call to Nuget was downloading a page instead of the package, changed the URL to point to the package API.

[DamianEdwards]

@shirhatti

[shirhatti]

@BerserkerDotNet Thanks!