Steam Game Transfer Utility - darklinkpower/PlayniteExtensionsCollection GitHub Wiki

This plugin purpose is to make it easier to manage the installation of games between the configured libraries in your Steam installation Functions:

Function to copy your selected Steam games between the configured libraries in your Steam installation. If the game already exists in the target destination library, it will be replaced by the source game if it is detected as being an older version of the game.
Option to delete the source game after copying the source game to the target destination library. This option also deletes the source game if it also exists in the target destination library even if it's not copied.
Option to automatically start or restart Steam after processing games. Starting Steam again is necessary to make it reflect the changes in the libraries. It's also necessary to update your Steam library in Playnite to update the game paths after processing the games.