Because tracking this sucker down is too hard, and so is building all of Qt.
Current version = 6.6.1/5.15.11
Windows releases only. Zip files contain linguist.exe, lconvert.exe, lrelease.exe, lrelease-pro.exe, lprodump.exe, lupdate.exe, and lupdate-pro.exe. Executables are static, 64-bit/32-bit (Qt6/Qt5, respectively), and built with MSVC 2022.