Sitecore 10.2 installation and upgrade guide is available in the following path,
Steps to follow for upgrade Sitecore 8.2 to 10.2:
1. Create the Sitecore packages from Sitecore 8.2 web applications. Create the separate packages for Templates, Media, Renderings. Dictionary and Content.
2. Install Sitecore 10.2 fresh instance and make sure the features are running perfectly fine.
3. Take a back up of Master DB, Core DB and website folder of Sitecore 10.2 instance.
4. Install the Sitecore packages on the new Sitecore instance.
5. Take the backup of Visual Studio solution(All projects) for Sitecore 8.2
6. Remove the references (physical files or NuGet packages) of Sitecore.Kernel, Sitecore.Mvc and any other dlls are being used.
7. Change the target framework of the Project from 4.6.2 to 4.8.
8. Add the Sitecore.Kernel, Sitecore.Mvc and any other references using NuGet Packages required for Sitecore 10.2 version.
9. Clean up the deprecated methods from the code and apply the code fixes if required.
9. Build the Solution.
10. Publish it on the new instance website folder.
Changes in Core DB:
1. Custom config file created but not a part of Visual Studio solution.
2. Changes done directly in the default config files.
3. Custom Core created in Search.
4. Third party integrations.
5. Any endpoint stored in Sitecore needs to be updated manually.
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