Still working fine on High Sierra ONLY if you use HFS+ not APFS (having HFS+ for mac system drive also fixes the BootCamp Control Panel boot chooser in Windows - BTW, you still need to disable the Apple HFS driver files in Windows to fix System Restore). Additionally, I have Windows installed with (hybrid GPT) MBR boot not EFI on an old 2011 mac. It may still work for newer macs if you meet these two condition, HFS+ mac and MBR Windows, possibly only the HFS+ condition. So I guess this app is still slightly useful for old-school geeks like me.
As for MacUpdate posting this as "new" update, I completely agree, it's totally ridiculous.