Which binary to choose from?

All

Just a quick thing about downloading the software.  I want to install 7.6.1  onto a linux (ubuntu) client. I've got to the download page and choice is a little confusing.  Do I simply want the Client1 and 2 tar files or one of the specific linux ones. If so what is the diffeence between R and S in the name.

I looked around for a cheat sheet breaking down the install file names and explaining what each one covered but no joy.

Any help gratefully received.

thanks

Al