I’ve had my lead and software over 5 years now, I bought it as a bundle (ISTA, IMPA, etc) from an eBay seller, I don’t think he is on there now, the software is available free online if you can find it, I think one of them is “Mikes easy BMW tools”or something like that.
I’d also recommend NCS Dummy, which has a lot of the options translated.
Here’s a link to a tutorial for Dummy’s
Basically with NCSEpert you read the cars VO, (how it was specked when bought) then read a particular ECU, save the file, alter the option you want and then write it back to the ECU.
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Google is pretty good at translating but unfortunately the description for the options isn’t full German so doesn’t always make sense, you are better off typing the phrase into google and seeing what comes up, probably won’t be for an E89 but it will give you a good idea of what it is.