This information can be found on the System Requirements section on the Release Notes for each Toad Edge version.
As an example please find below the Operating Systems supported by Toad Edge 1.2:
Windows 10 (64-bit)
Windows 8.1 (64-bit)
Windows 7 (64-bit)
Windows Server 2012 R2 (64-bit)
macOS 10.13 High Sierra (64-bit)
macOS 10.12 Sierra (64-bit)
OS X 10.11 El Capitan (64-bit)
