Dynamic installation type

Here is what I need to do.

My setup search for a previous install of the software. If I find it I allow 2 different installation type: Update / New Installation, if no previous install is found the user con only select New installation.
How can I do it ?
For now the only thing I was not able to do is dynamically change the list of installation type.

Any idea ?

Another thing, I was not able to do, is to get the instType index from the onChangeSel callback. I tried to use
GetCurInstType $0
but $0 remains equal to 0 even when I change the installtype from the combobox.

So I have

InstType $(UPDATE)
InstType $(NEWINSTALL)
InstType /NOCUSTOM

and both InstType are using the same sections. I just use InstType as a graphic way to set a flag that will be used later on durinf the copy process

Then both my sections look like this:

Section "#1" Section1
SectionIn 1 2
...
SectionEnd

Section "#2" Section2
SectionIn 1 2
...
SectionEnd

Then because of this (same sections enabled in all the instType), GetCurInstType seems not to be working...

values with $(XYZ) should be used for translated strings use
${WHATEVER} for variables.

Maybe has nothing to do with your initial problem, but still...

those are for translation.
The name of my InstType depends on the selected language.
So no mistakes here 😉