first, open a terminal---things are much easier there.
If you have a tar.gz file, do this:
tar -xvf <filename>
this give you a folder with all the install junk in it---with v.2, I think it is .rpm files
you'll also find a folder with files relating to (I think) desktop integration--pick the appropriate one and get it in with all the other .rpm files
Now, are you on a RPM system? If so:
rpm -i *.rpm
If not, then Debian-based?
alien -d -i *.rpm (check man alien to be sure---this is supposed to convert to .deb format and install)
If you get stuck, post appropriate messages, directory contents, etc.