How to upgrade from 4.2 to 4.3?

How to upgrade from 4.2 to 4.3 ? Or when the upgrade will be available?

We are still testing a solution.
Also preparing another small update release 12.12.1, so waiting for that to go first before the update.

OK. I will try to reinstall then.

Why you guys upgrading? I think better is just install new version because it is just like 30min to do it. Anyway 1 in a year?! Then you install fresh new it always works better.