Installing netbackup client on linux

There must be at least a dozen threads about this subject but I failed to find my answer.

I understood that installing the client is as simple as extracting it to the server and executing the install script. but which tar file do I use? (there is one file of 2.4GB and one of 1.5GB) why are there 2 different files? (and why so big?)

also, I understand there is a way to push a backup client on a fresh server? does it work if my master server is windows? how do I do it?

thanks for the help