.tar.gz files are typically just source code. You need to compile it before you can run it. First, unpack the source (which I assume you have done). If there is a README or INSTALL file then read them
Usually though, a simple:
$ ./configure
$ make
$ make install (as root)
should do the trick.
And no, you do not need the original version installed.
Also, if you are indeed using Suse then you may want to have a look and see if there are any rpm files for ttd. May be easier to install.