As you may or may not know, before a new DCP-o-matic is "officially" released we mark it as a test version and offer it for download here:
https://dcpomatic.com/test-download
A great way to help the DCP-o-matic project is to download and test these versions to see if they work. While we have a reasonable suite of automated tests there is still plenty to go wrong!
If you want a reminder, I usually remember to post a message on twitter @dcpomatic about these new versions, and you can also get DCP-o-matic to check on startup by going into preferences and ticking "check for updates on startup" and "check for testing updates on startup".