From OpenLiteSpeed Wiki
OpenLiteSpeed 1.0.4 (Legacy - 2013-6-25)
OpenLiteSpeed 1.2.11 (Legacy - 2014-9-26. Supports SPDY/3 and 3.1, WebSocket proxies, OCSP stapling, and protection against the Shellshock Bash vulnerability.)
OpenLiteSpeed 1.3.12 (Legacy - 2015-6-30. Features page caching module, LSIAPI for third-party module integration, HTTP/2 support, and protection against the Shellshock Bash vulnerability.)
OpenLiteSpeed 1.4.28 (Current stable edition. Features Lua, PageSpeed, file upload, upload progress and shared memory support, PHP 7 support, RCS integration, HTTP/2 support, and all configurations in plain text.)
You can also download OpenLiteSpeed for CentOS from our repositories.