FYI: WSUS Offline Update uses version 2.54 of Microsoft Sysinternals sigcheck.exe and sigcheck64.exe (in the bin subfolder). Version 2.55 has just been released:
Sigcheck v2.55
https://technet.microsoft.com/en-us/sysinternals/bb897441.aspx
By Mark Russinovich
Published: May 22, 2017