Linux Lite 6.6 Final Released

[stevef]

There is some way to upgrade to the 6.6 version from my current one (6.4)  without erasing my disk ?

Yes, just done it on my system.  In-series upgrade don't involve re-installs.

From the Lite Welcome screen
Select Install Updates
Scroll Down to find an Upgrade to 6.6 button

Or
Menu
Settings
Lite Upgrade

If you don't see these options, the instructions in the announcement should help.