Final Cut Pro 10.4.6 does not have an official "portable" version from Apple. However, you can create a highly mobile editing setup by running your and Media from a formatted external drive. This version is particularly important for users on older macOS systems (like Mojave 10.14.6) as it was the last to support certain legacy media formats before the removal of the QuickTime 7 framework. System Requirements for 10.4.6
The term "portable" in the context of Mac software usually refers to a pre-installed version of the app that can run directly from an external drive or a USB stick without needing a full system installation. Benefits of a Portable Setup final cut pro 1046 dmg portable