A portable version of a software runs directly from a USB flash drive or external hard drive without needing to be installed on the host computer. This is crucial for data recovery for two reasons:

Always launch the executable file from a USB drive, never from the drive you are trying to recover data from.

What is EaseUS Data Recovery Wizard Professional 14.2 Portable?

If the Quick Scan doesn't find your files, let the Deep Scan run to completion. Interrupting it can lead to incomplete file structures. Pros and Cons

Recovering files that were hidden or deleted by malware. How to Use the Portable Version Safely