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One can avoid having multiple instances of the attribute 'System.Reflection.AssemblyInformationalVersionAttribute' by ensuring that the attribute is only included once in the AssemblyInfo.cs file for their project. If there are multiple files with this attribute, they should be consolidated into one file and the attribute should be removed from the others. Additionally, it's important to check for any NuGet packages or third-party libraries that may be adding the attribute and ensure that they are not conflicting with any other instances of the same attribute in the project.