upgrade problem with old settings...

[m^2]

Peti]
The biggest trouble would be main menu and buttonbar.
And the installer should install scripts to upgrade and a version info file.

Menu is not a problem

Code:

IF branch EXISTS
    FIND the last existing predecessor
    ADD entry after it

I don't think that modified buttonbars can be updated - because of alignment problems.

What install scripts are you thinking about?
About version info - Indeed it's needed. AFAIK it's going to be there as a side effect of another addition since 2.6.
EDIT: I missed that 2.6 is released already
And it is there. So maybe one day a newer version of TCUP will be able to update from 2.6. Almost no chance with older versions.