If your version is correct, you should be good to go. Don't know why the creation date is that old. Weird. I assume you're running windows. Can't ever tell what's going on with stuff on windows. As far as running multiple versions, I belive both FF and TB are set up at the current time to replace any existing installation.
Because I run Linux, that gives me a bit more flexibility about such things, and I have both FF and TB install with a directory name that matches the version number, then I change a symbolic link that points to the version I want to use. This makes it easy for me to back out to a previous version if I ever need to do that. I don't know if that is even possible with windows.
Thanks for your help.