This is the most critical step. Since the official EA servers are gone (or you are playing a cracked version), the game relies on a local server emulator included in the repack.
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In the context of software downloads, "Solid Piece" (or similar terms like "Single Link") usually indicates that the entire game and all its components are provided as a or one large archive, rather than being split into multiple smaller parts that need to be joined together. This is the most critical step