While there is no official "portable" version, the original PC version (v1.0) is highly valued for its flexibility.

The original game files are compressed into a single .rar or .zip archive to reduce download size.

Search on reputable forums like GTAForums or Reddit to see if others have successfully used that specific download source. How to Run Portable GTA San Andreas

The original installation of GTA San Andreas requires multiple gigabytes of storage space. Archiving tools use compression algorithms to reduce this footprint, making the file significantly faster to download over the internet. How to Safely Extract the Files

Grand Theft Auto: San Andreas remains a masterpiece of open-world gaming. Whether you want to relive CJ’s journey on a work laptop or keep the game on a thumb drive for gaming on the go, a version is the most convenient way to play.

was built for older operating systems. Running a raw, uninstalled portable folder on modern Windows versions without proper registry keys or administrative configurations frequently leads to immediate crashes, mouse freezing, and resolution errors. Safe and Legitimate Ways to Play

The classic version is much easier to mod. Portable versions often act as a stable base for implementing massive overhauls, graphics improvements, or SAMP (San Andreas Multiplayer). Key Features of the San Andreas Experience