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To upgrade from v6.7 and prior to v6.8+, you will need to remove all the DLL references to PDFTron libraries and follow the steps below.
If your app is integrating via online NuGet distribution , you can simply install the latest version via Manage NuGet Packages... window. Click Update for each package.
If your app is integrating via the manual process , you will need to follow the same steps again whenever a new version of the PDFTronXamarin library zip is obtained.
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