Capturing Firefox then installing to a specific directory

Hi Guys,

I'm pretty new to ThinApp - currently running version 5.0.

my question is - I can do the capture and build process fine but how would I go about installing the finished .MSI file to a specific location for example : C:\Program Files (x86)\vApps\Mozilla?

I have tried this command line  - msiexec.exe /i firefox.msi INSTALLDIR="C:\Program Files (x86)\vApps\Mozilla" /qn - which installs to the directory however when I run the firefox.exe I get the error:

any ideas ?

thanks