Install AAC libraries
Windows:
1. Download libfdk-aac-2.dll from this folder
2. Go to the installation directory of butt by typing %LOCALAPPDATA%/butt into the file explorer
3. Copy libfdk-aac-2.dll into the installation directory of butt
4. Restart butt

MacOS:
1. Download libfdk-aac.2.dylib from this folder
2. Open your Applications folder
3. Right click on butt.app
4. Select Show Package Contents
5. Copy libfdk-aac.2.dylib next to the butt executeable in Contents/MacOS
6. Restart butt