Go to Options > File Settings . Change the "User data folder" to a relative path (e.g., .\UserData ). This ensures your presets, recorded audio, and exported beats save to the USB drive, not the borrowed computer.
Image-Line, the developer of FL Studio, does not release an official portable version of the software. Most "portable" versions found online are unofficial modifications or "repacks" [7, 40]. Official Installation Fl Studio Portable 32-bit