1. Can I upgrade without any problem in the following:
Joomla 2.5.11
Virtuemart 2.0.20b

2. Can I install without any problem in the following:
csvi pro
jce editor
Acymailing 4.2.0
roksprocket
pkg_xmap-2.3.2

3. Can I copy table (only vm) from my database to jare dadabase without any problem

Thanks

Dear Stefanos Pramadiotis,

You should backup your website before update and install extensions, maybe it occur error in updating or js conflict or maybe it work normally. We only know errors or not after you done. You shouldn't copy table on vm to jare dadabase, maybe it will occur errors about data.

Thanks