how do we upgrade from CU 01 to CU 02 version?
is that possible?
Of course it is possible to upgrade from CU 01 to CU 02. But I guess you are asking specifically to the extensions?
Here you would also need install the new versions of the extensions as well. Something you must do after you have upgraded the non-extension parts.
You can read about upgrading extensions here:
Thank you very much Erik