I am in this same boat. Bought a house in Dec with the lastest Vivnit System installed and verified that the software is version 3.6 which from what I have read can not be hacked into. I did call Vivnit but they would not tell me who the tech was that installed the unit and not give me the installer code unless I reactivated the system @ like $45 a month and I was like no way. So basically I have a worthless system installed. It appears that if I purchase a 2GIG system that all of the sensors have the same dimensions so I would just need to swap them all out. I wasn’t able to get into the Vivnit panel so I have no idea what all devices are in my house. I have seen the door sensors, what appears to be a glass break sensor, and 2 motion detectors. Does Vivnit install windows sensors too because I have not seen any of those? Any help or advice would be great.