Hello! We completely understand that the lack of updates has become a growing concern.
We are happy to inform you that our engineers have been working on updating the builds-- Windows is on its way; Mac will follow! 
Here’s our Windows Forums release if you’d like to test: New Insync version: 3.8.11 (Windows)
v3.8.11 for Windows will be officially released on our downloads page this week. Thank you!