What does the field on the right say when you click on the v9 dp6 button?
To answer your question:
STABLE (no designation)- These releases are stable public releases.
RC - Short for "Release Candidate", these releases are feature complete and have been made public to allow LiveCode developers to test whether they think the release is stable. Users who find bugs can file them at
http://quality.livecode.com.
DP - Short for "Developer Preview", these releases are not feature complete and are likely to contain bugs. They have been made public to allow LiveCode developers to experiment with the latest features and give feedback to the team. Users who find bugs can file them at
http://quality.livecode.com.
But I'm still curious to know what the DP text says; hopefully it notes that it's a pre-release build.
The team is quite active, with new releases coming out every few weeks. If you don't want to get notifications of new builds that become available you can turn those notifications off in the Updates section of LiveCode's Preferences window.