Beta Versions
From ChangesWiki
Getting on the Beta Bandwagon
If you'd like to get on the beta bandwagon, close Changes, and execute the following command using the Terminal:
defaults write com.skorpiostech.Changes SUFeedURL http://changesbeta.s3.amazonaws.com/changes-beta.xml
Please submit bugs if you find them in the beta version. From time to time, support may also request for you to download and test the beta version, to see if your reported bug has been fixed.
Going Back to the Released Version
If you want to revert to the released version, close Changes, and execute the following command using the Terminal:
defaults delete com.skorpiostech.Changes SUFeedURL
Then delete any versions of Changes you have on your machine (usually in your /Applications folder). Re-download the released version of Changes and copy it to your /Applications folder.
Disclaimer
The beta build posted here is not meant for production use. Please note that it could eat your data or your machine. Caveat downloader.