Before downloading and installing the iText 5 Software Products, you need to agree upon our iText license agreement. You can read the iText license ageements here.
To download iText Sharp (.NET) you can download from either NuGet or GitHub
See below for instructions for each platform.
iTextSharp on NuGet
You can also install iTextSharp from NuGet. Just run the following command in the Package Manager Console:
PM> Install-Package iTextSharp
The other packages (for PDF/A, extra functionality, XML Worker, XFA Worker, and the License Key library) can be installed using similar commands:
PM> Install-Package itextsharp.pdfa
PM> Install-Package itextsharp.xtra
PM> Install-Package itextsharp.xmlworker
PM> Install-Package itextsharp.xfaworker
PM> Install-Package itextsharp.licensekey
iTextSharp on GitHub
itextsharp-all-x.y.z.zip contains zip files with the core DLL, the PDF/A DLL and the iText xtra DLL. It also includes ZIP files with the source code.
itextsharp.xmlworker-all-x.y.z.zip contains zip file with the XML Worker DLL and source code.
Always make sure that you're using DLLs with the same version number, e.g. don't mix iTextSharp 5.4.0 with XML Worker 5.5.7.