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Vega is a popular alternative, especially in Europe. It is free for tournaments with fewer than 40 players. It handles Swiss, Round-Robin, and even supports electronic boards. It is updated regularly and runs perfectly on Windows 10/11.
The chess world has moved forward, and there are now several powerful alternatives that are free, open-source, and actively maintained. If you cannot secure a legitimate Swiss Perfect key, it is highly recommended to migrate to one of these platforms: swiss perfect registration key
Websites offering a "Swiss Perfect registration key" are almost always traps. They fall into three categories: Vega is a popular alternative, especially in Europe