Divinity II is a third-person action RPG where players can eventually transform into a dragon to engage in aerial combat.
While GOG.com itself is a safe, curated storefront, the presence of a .rar extension often suggests the file was obtained from a third-party file-sharing or archival site rather than the official GOG Galaxy client.
Large game installers from GOG are often split into multiple .rar or .bin parts (e.g., part1, part2) for easier downloading. You must have all parts in the same folder to successfully extract and run the installer.