Hello, I have a website that uses SP Builder 2.3.5 lite version. I just bought the new SP Builder, and I want to update it to have the full fuctions. But if i try to install the new component v4.0.6 , I get an error, all the previous pages are lost and the add new page don't work either If i try to instal the new component v3.8.9, I get an error, the previous pages aren't lost but on my page they are not appearing.

How is the prefered method to upgrade without losing my pages?

Also even now that i recover files and backup, I get an error "0 Call to undefined method SpPgaeBuilderBase::k2CatList() " when trying to acces my pages in the backend..

Thanks in advance