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// For complete examples and data files, please go to https://github.com/groupdocs-watermark/GroupDocs.Watermark-for-.NET
using (SlidesDocument doc = Document.Load<SlidesDocument>(Utilities.MapSourceFilePath(FilePath)))
{
    foreach (var slide in doc.Slides)
    {
        string oldUrl = "http://aspose.com/";

        // Assign null to remove hyperlink
        string newUrl = "http://groupdocs.com/";

        // Replace hyperlinks in shapes
        foreach (var shape in slide.Shapes)
        {
            ReplaceHyperlink(shape, SlidesHyperlinkActionType.MouseOver, oldUrl, newUrl);
            ReplaceHyperlink(shape, SlidesHyperlinkActionType.MouseClick, oldUrl, newUrl);

            // Replace hyperlinks in text fragments
            foreach (var fragment in shape.FormattedTextFragments)
            {
                ReplaceHyperlink((ISlidesHyperlinkContainer)fragment, SlidesHyperlinkActionType.MouseClick, oldUrl, newUrl);
                ReplaceHyperlink((ISlidesHyperlinkContainer)fragment, SlidesHyperlinkActionType.MouseOver, oldUrl, newUrl);
            }
        }

        // Replace hyperlinks in charts
        foreach (var chart in slide.Charts)
        {
            ReplaceHyperlink(chart, SlidesHyperlinkActionType.MouseOver, oldUrl, newUrl);
            ReplaceHyperlink(chart, SlidesHyperlinkActionType.MouseClick, oldUrl, newUrl);
        }
    }

    // Save changes
    doc.Save();
}

//Below is the function to replace hyperlinks

private static void ReplaceHyperlink(ISlidesHyperlinkContainer hyperlinkContainer, SlidesHyperlinkActionType hyperlinkActionType, string oldUrl, string newUrl)
{
    if (hyperlinkContainer.GetHyperlink(hyperlinkActionType) == oldUrl)
    {
        hyperlinkContainer.SetHyperlink(hyperlinkActionType, newUrl);
    }
}