No, I can't find source there.
This is list of all files in the download:
GalaSoft.MvvmLight.dll
GalaSoft.MvvmLight.Extras.dll
GalaSoft.MvvmLight.Extras.xml
GalaSoft.MvvmLight.xml
NAudio.dll
System.Windows.Interactivity.dll
System.Windows.Interactivity.xml
VoiceRecorder.application
VoiceRecorder.Audio.dll
VoiceRecorder.Audio.pdb
VoiceRecorder.Core.dll
VoiceRecorder.Core.pdb
VoiceRecorder.exe
VoiceRecorder.exe.config
VoiceRecorder.exe.manifest
VoiceRecorder.pdb
VoiceRecorder.vshost.application
VoiceRecorder.vshost.exe
VoiceRecorder.vshost.exe.config
VoiceRecorder.vshost.exe.manifest
plus some directories with I think language resources: System.Windows.Interactivity.resources.dll