A portable version of Adobe Premiere Pro is a repackaged version of the software that can be run from a USB drive, external hard drive, or any other portable storage device. This version is designed to be self-contained, meaning it doesn't require installation on the host computer. The "64 Bits" refers to the software's architecture, which is optimized for 64-bit operating systems. The "Repack" term indicates that the software has been re-packaged to make it portable, often by modifying the installation files and scripts.