Hello Simon,
The
Run-Time Engines are not backwards compatible. I.e. LabVIEW Run-Time
Engine 8.5 cannot run executables made in LabVIEW 8.2.1.
So, you need to install the Run-time engine for the version of LabVIEW that
the code was written in. E.g. If your VI was written in LabVIEW 8.5,
you need to have the LabVIEW 8.5 RTE (Run Time Engine) installed in
order to run it after it is compiled into an executable.
In order to check which Run-Time Engines you already have installed to your PC, browse to the following directory.
C:\Program Files\National Instruments\Shared\LabVIEW Run-TimeIn
that directory, you will find a different folder for every version of
Run-Time Engine that you currently have installed onto your system.
Hope this helps!
Kameralina