Unble to check if a registry exists using Get registry key command in Wise script

Hi,

I need help on this please.

I basically want to check if an application A already exists in the system, if does not exist, install app A, if exists exit the program.

 I am running this on windows 7 64 bit app. Once I install the app A, the uninstall string goes to HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{A5DCF955-5D4A-471D-8CB3-DCFDF5C5DEE7}

With DisplayVersion as 12.1.5337.5000

So here I am checking this value

Below is my script

item: Set Variable
  Variable=REG
  Value=SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\
end
item: Set Variable
  Variable=PRODUCTCODE
  Value={A5DCF955-5D4A-471D-8CB3-DCFDF5C5DEE7}
end
item: Get Registry Key Value
  Variable=TEST
  Key=%REG%%PRODUCTCODE%
  Value Name=DisplayVersion
  Flags=00000100
end
item: Display Message
  Title=%TEST%
end
item: Exit Installation
  Variable=2
  Value=
end
 

However here, when I run the script, even if the registry is there it still returns back a null value!!

Please advise...

Thanks in advance.