First off, you should know that "latest revision" isn't a phrase that will earn you any respect here from what I have noticed from reading around. Post your exact revision. Secondly, if TC is saying you have 0.9.8 installed, you probably do, and need to uninstall that and reinstall version 1.0.0 or later. Thirdly, without knowing what operating system you use, it's next to impossible to give you advice on how to do that. Are you running Windows, Linux, OS X? Be specific and you'll be more likely to get useful help.
Also, checking and following the guides on the wiki make the process nearly fool-proof.
Windows: http://collab.kpsn.org/display/tc/How-to_Win
Linux: http://collab.kpsn.org/display/tc/How-to_Linux
OS X: http://collab.kpsn.org/display/tc/How-to_Mac
