I am trying out aspose.pdf and testing your demo for extracting text. This is an evaluation version.
I am using Visual Studio 2005 v8 and the .NET framework v2.0.50727
I had added a reference to aspose.pd and the two dlls are in the bin directory
When I build the project the compiler recognises the statement
However the statement
Dim pdfDocument As New Document(Pdf.InputStream)
throws an error because the Document type does not exist.
On the other hand the statement
Dim textAbsorber As New TextAbsorber()
does not throw an error.
It seems to me that I must have gone wrong somewhere in the installation, and part of your software is installed, but not correctly.