So I check google, first links after rescuetime.com itself, tell you to go to softonic, blah... I dont like that site, it will give you a downloader first, before you can get the real one, no more for spam please.
So with great curiosity, I was back to rescuetime site and doing carefully inspection read, arrghh... found out, it was simple, scroll a little bit and there... you'll find it... at the bottom !!
Whaat.. the... hell..., Hi Rescuetime, your system wont work without the monitoring client app, why you put that important link with very small font at the bottom man, its stupid !!
Clicking that link, will take you to this page, just klik the link to download it, not the button at the bottom right for next step (if you already signed up, like me)