Launcher only: nothing needs rebuilding. Press Update now in the launcher.
- The game closes right away on older processors (#25): the game needs a processor with AVX2 (Intel Haswell / 4th-gen Core / Xeon E5 v3 and newer, every AMD Ryzen). On older ones (Sandy Bridge, Ivy Bridge, Xeon E5 v1/v2) it stopped before the first picture with no explanation. The launcher now says so plainly when this happens, warns before a build when Windows reports the processor has no AVX2, and Report a problem lists the processor and its AVX2 support.