After installation, most repacks offer a tool to "Verify BIN files" to ensure nothing was corrupted during the long decompression. Vital Safety Warning

Modern compression tools are often flagged as "false positives" by Windows Defender. It is common practice to disable it during the install.

If you are looking for a "highly compressed" version, these are the features you should expect:

The ability to choose between Campaign, Multiplayer (local/bot support), and Spec Ops.