b2evolution v7.2 is considered very stable now and used by many users as well PRO clients.
You can find b2evolution v7.x in the download area.
We also made a quick video to show v7 (others should follow):
Please note we will stop supporting b2evolution v6.x by the end of September 2020. If you haven’t done so yet, we recommend that you upgrade to b2evolution v7 now. There are no specific issues with upgrading from v6 to v7. The v6 skins will work without modification on v7.
Everyone Stay Safe! ;)