Using "repacks" or third-party serial keys from unofficial sources carries several dangers: MicroStation V8i [FAQ] - Communities
Bentley Systems has fully transitioned to the (versions 2023 and later). V8i SELECTseries 3 has not received a security update since 2018. Even if you found a working serial key, you would be running unsupported, vulnerable software.
Bentley uses a specific licensing system that requires an authorized and Site Activation Key from your organization's administrator.