You already have a post like this no need for a second one.

e46, e39 and e53 are all pretty much the same as far as coding goes.

You have two options:

1 - Buy the hardware/software like BMW scanner 1.4 or Carly and learn to code it yourself

2 - Install the software yourself on a laptop and try and get someone who knows what they're doing to help you do the rest via remote software like teamviewer.

I told you already you can borrow my laptop so it's up to you to find someone and talk them into helping you do the coding.