If you just want to unrar files, I Was able to do that with SharpCompress
First I created a new VB.Net App and added a reference to SharpCompress.dll before using this code to extract all the files from a Rar file.
'Imports
Imports SharpCompress.Archives
Imports SharpCompress.Common
'Unrar code
Dim archive As IArchive = ArchiveFactory.Open("C:\file.rar")
For Each entry In archive.Entries
If Not entry.IsDirectory Then
Console.WriteLine(entry.Key)
entry.WriteToDirectory("C:\unrar", New ExtractionOptions With
{.ExtractFullPath = True, .Overwrite = True})
End If
Next