At https://qbittorrent.org/download.php the link to signature of x64 installer signature is https://sourceforge.net/projects/qbittorrent/files/qbittorrent-win32/qbittorrent-4.2.0/qbittorrent_4.2.1_x64_setup.exe.asc/download
correct link of course is:
https://sourceforge.net/projects/qbittorrent/files/qbittorrent-win32/qbittorrent-4.2.1/qbittorrent_4.2.1_x64_setup.exe.asc/download
At https://qbittorrent.org/download.php the link to signature of x64 installer signature is
https://sourceforge.net/projects/qbittorrent/files/qbittorrent-win32/qbittorrent-
4.2.0/qbittorrent_4.2.1_x64_setup.exe.asc/download
correct link of course is:https://sourceforge.net/projects/qbittorrent/files/qbittorrent-win32/qbittorrent-
4.2.1/qbittorrent_4.2.1_x64_setup.exe.asc/download
The 32 bit version has the same issue.