The world's strongest chess engine, which is open-source and safe to download directly from the official site.
If you want to play or study chess without security risks, consider these reputable options: Download Chess16 [Kuyhaamee] zip
A completely free, open-source platform for playing and learning. The world's strongest chess engine, which is open-source
If you are trying to download chess software safely, here is how to handle such files: The world's strongest chess engine
Use tools like VirusTotal to upload the file and scan it against dozens of different antivirus engines.
A robust, free offline training program for Windows.
If you have already downloaded the file, do not double-click the .exe inside. Instead, right-click the zip and select "Extract All" to inspect the contents without running them.