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What you download is source — the projects, as the book builds them. There are no prebuilt executables, deliberately: an unsigned binary means SmartScreen warnings and antivirus false positives, and code-signing certificates are a cost and a chore that would buy you nothing. You build it, which is the point of the book.
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A C++20 compiler, CMake and Ninja — MSVC, Clang or GCC. Everything else the engine needs it builds itself. Chapter 2 of Book 1 sets the toolchain up from nothing, and it is free to read before you pay anything.
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