All good on Windows, now also on 32-bit x86. Binaries and sha256 hashes:
LLVM-19.1.0-rc4-win32.exe
0daf7a006b62ff364e5d4ee50636fe93bcd972091f84825762b291ba25ef054e
LLVM-19.1.0-rc4-win64.exe
3506fb8d992fee809389695d29245688ddff816e983101f42fcb1d4146ed0d09
clang+llvm-19.1.0-rc4-x86_64-pc-windows-msvc.tar.xz
ccec79acc9b74ae3c45cf913e79c4eb46bf17dc3378552ec9d1591456c5455af