yep, it's free. all versions of the game will be free. I just do an early release to those who donate but i always wanted the full game to be available to everyone. The original version is here on the page, just scroll up to Downloads and pick one of the Str8 v0.21.4 either for PC, MAC, or Android. (if for some reason you can't find it, just let me know which version you want and i'll just reply back to this thread with a direct link for you).
Warning on that version, it starts rough because i had no idea what i was doing. You can jump to the chapter you want to start but also keep in mind that I was suuuuper new, the visuals start bad but progressively get better, and there's no sound or music (couldn't afford it yet). If you start at the beginning, you have to keep trying different choices until you get the right combination to move things forward (If you get stuck there's a readme file in the game folder with a walkthrough) but that gameplay ends by chapter 4 i think. After that, the original game is much more linear and smoother.
IF i had a recommendation for you, it would be to wait until the FREE v09 of the revamp comes out because it ends Chapter 4. Then you could download the original game and start a new game and pick it up at Chapter 5 and it would probably be a smoother play experience. that's how i'd do it :)