I'm trying to connect my older Macbook Pro to my Multiplus 24V3000/120v. I'm using a new out of the box MK3-USB interface. I've followed all the procedures: my Mulitplus is powered by DC. All other components are disconnected. I am using a Victron RJ45 Cat 5 cable to connect to my Macbook pro running Victron Connect v5.8. I tried running the older version of Victron Connect v3.2 and the newest on my wife's new Macbook, without success. The sticker inside the Multiplus reads: 2012120.HEX. What am I doing wrong?