The answer to 'how to install panel upgrade' is that upgrading your electrical panel is a complex task that is best handled by a licensed and experienced electrician. Attempting a panel upgrade without the proper training and expertise can be extremely dangerous and may violate local building codes.
A panel upgrade typically involves replacing an older, outdated electrical panel with a newer, higher-capacity model. This may be necessary if you are adding major new electrical loads to your home, such as an electric vehicle charger, a hot tub, or a large appliance. A panel upgrade can also improve the safety and reliability of your home's electrical system.