BMW ISTA-D 4.39.20 Standalone Activated - Torrent

[Mark910]

Hello,

I am pretty new here, so I would have some questions. 

I have a G21 modell, so If I want to use the ISTA with this, can I install it simply with the installer?

If I would like to do only diagnostic, do I need to psdzdata lite or not? 
From where could I download the latest psdzdata lite file?

Sorry for the questions and thanks for the help in advance.

BR,
Mark