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I get an error like "Unknown method in filename"!

Older WinRAR versions (< 2.90) don't have the improved compression methods found in WinRAR 3.0 and above.

Either a RAR 3.0 archive is being unpacked by RAR 2.8 or older or a ACE 2.0 archive is being unpacked by WinRAR 2.8 or older.

In this case please update your old WinRAR/RAR version to the actual release.

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