The DRM-free GOG version allows you to change languages either through the GOG Galaxy client or via offline installers. Using GOG Galaxy: Open GOG Galaxy and select Skyrim Special Edition.
Whether you bought Skyrim Special Edition on Steam, GOG, or another platform, it's important to understand how the game handles languages. The game files are organized, and "English" is usually the master language that all other localizations are based on. Skyrim Special Edition English Language Pack
If your game remains in the wrong language after a download, you may need to edit your configuration files: The DRM-free GOG version allows you to change
: Basic names for items, locations, quests, and some UI elements. .DLSTRINGS or another platform
Or manually delete Data\Strings\*_English.* and re-verify.