I am sure this is very trivial question nevertheless I was unable to find an 
example or any kind that would clearly illustrate how to change the install 
path based on the combination of conditions.

I am trying to install a module that should work with several versions of the 
product X. Product X exist in several versions and changed its name over the 
time of its existence. The problem is that name change of the product also 
changed the registry key name which I was reliant on in the past. So now I need 
to check whether my user is about to install my add-on for product X on the 
system with an pre-renamed version (Registry Path A) or post-renamed version 
(Registry Path B)... Naturally I case search the registry for two separate 
location, what I can't figure out is how to supply end result to the child 
directory of the TARGETDIR? In the snippet of code that I've attached below 
I've marked the "problem" spot as " V1V2_DIR or V3_DIR"...
Do I user some sort of the custom option? Can I use <?if?> statements?
All I need is to express is something like this...
IF V1V2_DIR !=  NullOrEmtry
var.Something = V1V2_DIR
ELSE
var.Something=V3_DIR

How do I do that? Thanks for your help!

    <!-- Is host product installed? -->
    <Condition Message='[CONDITION_MSG_02]'>V1V2_DIR OR V3_DIR</Condition>

    <!-- MIIS installation path-->
    <Property Id='V1V2_DIR'>
      <RegistrySearch Id='V1V2Registry'
                      Type='raw'
                      Root='HKLM'
                      
Key='SYSTEM\CurrentControlSet\Services\ProductAName\Parameters'
                      Name='Path' />
    </Property>

    <Property Id='V3_DIR'>
      <RegistrySearch Id ='V3Registry'
                      Type ='raw'
                      Root ='HKLM'
                      Key 
='SYSTEM\CurrentControlSet\Services\ProductBName\Parameters'
                      Name='Path' />
    </Property>

    <Directory Id="TARGETDIR" Name="SourceDir">
      <Directory Id="V1V2_DIR or V3_DIR" Name='DirectoryNameGoesHere'>
          <Directory Id='EXTENSIONSDIR' Name='Extensions'>
...



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