The installation instructions for the June 13th update ask for these build numbers prior to installation:
  • Scan Tool: 515
  • ObdiiV7.dll: 644
  • Tuning Tool: 622
I had installed the June 2nd update so I figured I need to uninstall first and then installed 7.4.2. When I went to check the build numbers, Scan failed to launch with a popup that said:
The procedure entry point obdiiEcmBd@4 could not be located in the dynamic link library obdiiV7.dll
Eventually I uninstalled, manually removed C:\Program Files\EFILive and then was able to install 7.4.2 and find the right build numbers.