Well assuming you know howto research the level 1/2/3/4 of titan research, which i assume you do.

I'd bet on that weird installation method being the problem, and the only thing I can think of suggesting is to simply delete everything and reinstall. Let the game automatically update the version for you.

I mean, you do own it i assume, so shouldn't be a problem.

You must research all 4 of the techs to fully build a titan. Each tech lets you increase how much of it you can build until you can finally reach 100% on the 4th one. It's kind of weird, but could be used in titan rushes to let you get started building the titan before you have all the labs to research it (though I rarely see this happen).