Most have switched to Vega (European/Asian federations) or Swiss Master (casual clubs). Some still use Swiss Perfect on old XP machines, but they already own legitimate lifetime licenses from 2005.
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While Plum Software no longer exists, the copyright has not been explicitly released into the public domain. Distributing or using cracked keys technically violates copyright law, even if the owner is absent. In rare cases, tournament organizers have been disqualified or fined for using unlicensed software in official FIDE events. Most have switched to Vega (European/Asian federations) or