Expert Sleepers Warbler v1.1.0 - Manual (Page 7)

Installation
Mac OS X
Simply copy the plug-in to the appropriate folder:
Library/Audio/Plug-Ins/Components
for the Audio Unit version, or
Library/Audio/Plug-Ins/VST
for the VST version.
Windows
Simply copy the plug-in to your VST plug-ins folder.
System Requirements
Mac OS X
Warbler requires at least Mac OS X version 10.2.8. Version 10.4 or higher is recommended.
The plug-ins are Universal Binaries and so will work on PowerPC or Intel Macs.
The Audio Unit version will work in any Audio Unit host.
The VST version requires a “VST 2.4” compatible host. 1
Windows
Warbler has been developed and tested with Windows XP SP2. It may work with other
versions of Windows (Vista included) but this is by no means guaranteed.
The plug-in requires a “VST 2.4” compatible host.
1 VST is a trademark of Steinberg Media Technologies GmbH.