Learn how to solve the error "Error while Updating Plugin Assembly" in Plugin Registration Toolbox by upgrading your project in Visual Studio to compile using the correct .NET Framework version as suggested in the error. You can download the correct version from the Microsoft website and install it. Once installed, close and restart Visual Studio and check the Applications section in Project's Properties to ensure the installed version appears there. Select the installed version, apply it, and compile the assembly again. This will allow you to register your plugin on the Plugin Registration Tool successfully.
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