I already know where the problem is. The machine is still using build 100 (that was part of beta 2) which cannot be directly updated to RC-x builds (as noted in the readme ;))

A quick workaround is:

  1. On that machine, delete the reg key HKLM\Software\ALWIL Software (yes, brute but effective)
  2. Push a new installation onto the machine from the console.

Thanks
Vlk