Where can I download a previous version of the Studio?
From Fretlight Knowledgebase
You can download the Fretlight Studio 4.5.1 from the link below.
http://www.fretlight.com/downloads/FretlightStudio_4_5_1.zip
You can also try the Fretlight Studio 4.1 from the link below.
http://www.store.fretlight.com/old-fretlight-studio/FretlightStudio_4.1.0236.zip