Since version 8.0 the upgrade
process allows you to upgrade your project by automatic update of the assemblies reference. Along with the recently introduced one-step upgrade and automatic update of the necessary changes in the web.config file the process is facilitated a lot.
However the upgrade process also depends on the project customization. In case of custom code you need to update it manually, if there is any API changes
In addition, it is highly recommended to upgrade the project locally (not on the live server directly) and check if it works correctly before deploying
Do you want to have your say in the Sitefinity development roadmap? Do you want to know when a feature you requested is added or when a bug fixed? Explore the Telerik Sitefinity CMS Ideas&Feedback Portal
and vote to affect the priority of the items