Gloops - 2023-08-06

Hello everybody,
I try to run the "Hello World" project read on pdfsharp.com, but as I understand, the version for .Net 6 is published there.
My project is on .Net 4.7.2, so I downloaded sharpPDF 2..0 beta 2.
Some objects as PdfDocument, PdfPage, XGraphics, are not recognized. For XGraphics I imagine it is GDI+ that is missing, but I am hesitant about how to declare it.