https://jazz.net/downloads/RationalTeamConcert/1.0/1.0/install-repository/parts/common

Hi Kyzel Marie,
I'm afraid that RTC 1.0 went out of support a few years ago, on 30 April 2012 to be exact. That is why the downloads are no longer available. See.

IBM software support lifecycle Rational Team Concert 1.0.x
http://www-01.ibm.com/software/support/lifecycleapp/PLCDetail.wss?q45=B950770E48540J54

You can see when the versions of our products move out of support on the following page:
http://www-01.ibm.com/software/support/lifecycle/index_r.html

Sorry to disappoint you,
Simon