Legitimate repackers (such as those in the warez scene) use sophisticated installers that decompress high-compression archives during installation. However, the installer itself must contain the data. If the installer is 200MB, the installed game will still be several gigabytes, or it will be missing the majority of its content.
Be extremely careful where you download these. "Highly compressed" executables are common wrappers for malware. Always scan the folder with Microsoft Defender or Malwarebytes before running any .bat or .exe files. gta san andreas highly compressed 200mb pc install
community-made "highly compressed" versions aim to reduce this footprint to as little as for easier distribution on low-end hardware Legitimate repackers (such as those in the warez