You can get this latest version of PHP LSAPI by force upgrading LSWS to version 5.0.9 to get the latest build.
I've already used 5.0.9 now.
I tried to switch back to 5.0.8, then deleted 5.0.9 files, and finally upgraded back to 5.0.9, but when i check my phpinfo, it's still said that i still use LiteSpeed V6.8
Thank you.