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Just installed 2018.4.5. I had an error upon first try (main screen was stuck saying that it was checking the status of the completed update and the binnacle display said that the main display was not responding and that I needed to do a restart). After rebooting, I restarted the update and everything went smoothly. Unfortunately, as noted above, the release notes are the same as 2018.4.1.
My Service Center said just wait, it will be sent again !
By the way, Toronto is a very nice city. I worked several times not far away from Toronto (Mississauga).
I received this update this morning, at the first attempt the update fail. I called the service center, after a hard reset from them they sent me the update a second time. This one did also not succeed.
I'm guessing there's a few version for various vintage cars/hardware setups? i.e. 2018.4.1 and 2018.4.5 are the same release really, just different cars get different versions of the same thing. I have 2018.4.1 ec044c8 and have a 2015 P90D with AP1. I don't imagine a 2017 100D with AP2.X is going to get the same version as me.