Hello, I have been receiving this error since yesterday upon manual updates. Other security software: Sandboxie, CIS v4, Immunet. Automatic updates simply fail, after I grant Prevx permission to write to C:\ProgramData\PrevxCSI\~PrevxCSIUpdate.exe when prompted by Comodo. I am stuck on v.140. Manual updates pop up a message on screen, saying download complete, installing updates. Then the update failed message appears. I'm running under LUA on windows 7 x64. If there is no easy fix, I will reinstall, but I felt obliged to bring this issue to your attention. Thanks in advance.