[pungo]

Welcome to the forum....
I seriously doubt the "DriveTrain Malfunction" error has anything to do with outdated software; use ista+ to diagnose the issue.

The downloadable software from the BMW website is typically basic stuff like newly added phone versions. I downloaded UPD01008 and installed it a while ago, it added support for newer phones and maybe some bug fixes...

With a vehicle over a decade old, there's probably is not any needed newer software/firmware, use e-sys to check the I-step version. You're not going to download newer versions from BMW, though you can update it yourself with e-sys from the PSdZ data. If it's not broke, don't mess with it.