We've developed both a Mac and Windows version of Adapter. Here are the OS requirements:
Mac OS X: 10.7 - 10.13 (Lion, Mountain Lion, Mavericks, Yosemite, El Capitan, Sierra, and High Sierra)
Windows: XP, Vista, Windows 7, Windows 8, and Windows 10
Adapter also needs to download and install FFmpeg and VLC Media Player which are both free and necessary for the conversion backend and media previews.