1. Locate the caraone.json file for the client:
Mac - ~/Library/Application Support/com.ObviousFuture.CaraOne/caraone.json
Windows - C:\Users\YOUR_USER\AppData\LocalLow\ObviousFuture\CaraOne\caraone.json
2. Edit that json and add "ExperimentalFeatures": true, formatted exactly like the below screen grab. Spelling and punctuation are important.
3. Save it
4. Relaunch CaraOne client and you should see new features. In this example the AskCaraOne feature and the Prediction feature are beta at the time of this writing and get turned on for use.
5. When features are BETA, issues should be expected. Please help if you are able and log bugs for the dev team using the below article.