Can I re-download a game for more free time?

I've played a lot of those games, I know exactly what you're facing. So here's the solution: If you REALLY do not wish to pay, then you can un-install the current game you have and install the same game from another publisher. For example : You got Diner Dash from Yahoo! , the 60 minutes trial expired. You can google for the same version of Diner Dash but download it from another site, like Real Arcade or Shockwave. When it expires again, un-install it and download again from another site. Just a warning though, this may affect the performance of your computer. I've never had that problem before but it may happen on slow computers. Well, that's it. I hope I helped.

The games seem to hide some info in your Registry even after they are removed from your computer, the only way I can figure is to delete all the info from that game on the Registry. But beware, messing with your Registry without knowing exactly what you're doing can be dangerous. Best advice, just pay the $7 average that the games are selling for these days (at least Yahoo Games it seems). The whole purpose of a Trial Version is to give you a taste of what the game is like before you spend money on it.

Simple answer, No you can't. The only way you can do it is either wipe your computer and re-install your OS or just search google for a serial number for it