The Adobe AIR runtime is required for installation. See details at the Adobe website.
After download and install of the AIR runtime, launch the ÁSprite air file and follow the on-screen installation instructions. You do not need to uninstall when upgrading versions. To uninstall run the air installer program and select the extra options.
The initial AIR version of ÁSprite only adds very basic functionality compared to the browser and Flash Player versions.
You can drag and drop class files on the desktop icon. The class files must have been generated with ÁSprite to give expected results. Try for example with the sample AS3 or haxe files. If you use a commandline to start ÁSprite then you can give an initial class file name there as well.
A settings file is created in the application local store (autotelicum.muSprite/Local Store) with basic window state configuration information. On Windows it is placed at
C:\Documents and Settings\[User Name]\Application Data\autotelicum.muSprite\Local Store