Hi A.Rabbit,
I’m sorry we have not been able to help you with this issue. Thank you for providing your installer log file. I have been investigating it for some time now but I’m still unable to pinpoint the reason you are seeing this. In short, the error you are seeing is encountered when we try to run one of our VBScript Windows Installer custom actions. As far as I’m aware, we have not seen this custom action fail in any other cases so I’m not sure why you would be seeing this problem. In the future my plan is to move away from using VBScript in our custom actions but I realize that this does not immediately help you. I will open a ticket to investigate further.