Hello! On Mac, the save folder is "~/Library/Application Support/MaliXe Games/Steps 4 Happiness/".
But I've changed so much in this update that it's worth starting from the beginning. I will do my best to make sure this problem never occurs again.
At the moment I only posted the Windows version, the Mac and Linux version didn't fit in Ichi.io. I will look for the best option to leave the external download link and I will make these versions available soon. 😉