PA Soft for $20 and it's very straight forward for basic DTCs and other stuff.

I had to transition from Carly App that was actually pretty damn good for my E70 but useless on my E53 due to lack of support and found myself using PA Soft 1.4 as I think it's pretty UI friendly.

But sucks to have to drag my old laptop that I use every time, weights a ton LOL and do wish there was an app instead with more in depth functions for the E53.