Obviously, I can't predict when or if Apple will discontinue support for Snowy but my best guess is that it will happen as soon as Mavericks is released. Another wrinkle is that future updates to third-party apps may not work with Snowy. Ah, there's nothing like planned obsolescence... 
Jon
macOS 11.7.10, iMac Retina 5K 27-inch, late 2014, 3.5 GHz Intel Core i5, 1 TB fusion drive, 16 GB RAM, Epson SureColor P600, Photoshop CC, Lightroom CC, MS Office 365
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