Searching for a "highly compressed" version of usually refers to a repackaged version of the game that has been significantly reduced in download size (often from the official 40–47 GB down to much smaller sizes) for easier downloading.
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Generally, compressed versions found on third-party sites are intended for offline play (Career Mode, Kick-off, Tournaments). For Ultimate Team, the official EA version is required. Searching for a "highly compressed" version of usually