To check the ATF level, aside from what you mentioned, you need to have the ATF at the correct temperature - it's around 50°C. You said you have the software, so it's just a matter of plugging in the laptop and monitor the transmission temp. Once the temp is reached, you check it with engine running.

Also, if you have the software, it's not difficult to update the car, just follow the prompts and use your head.

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Stable: e92is, e46 M54B25, e83 N52, e53 N62 - sold, e39 M54B30 R.I.P.