Upgrade error when updating with package manager

I attempted to install and update to Aspose Total.NET and got this error. What is the cause.
Could not install package ‘Aspose.OCR 20.12.0’. You are trying to install this package into a project that targets ‘.NETFramework,Version=v4.6.1’

@salemantulsa,
You need to change the Target Framework of your .NET project to 4.6.1 or later and then let us know your feedback.