Dear,
Welcome to the board.
Now there is a public Kixtart 4.10 beta 1 (build 84) release, but remember
it is a BETA release.
The best upgrade at this moment is running KiXtart 4.02 build 71 release.
For an easy upgrade take a look at our site.
greetings.
btw: why you need specific this beta release.
btw: symbol 
on our homepage has been linked to related http://kixtart.org topic.
