VC++ requires Zorro S, but there is certainly also a solution for your problem with the free version. I only need to understand what you want to do. For what purpose do you have to write 15-digit numbers in your script?
My concern was that something was wrong and doubles were only 32-bit, based on my test scripts loading from a constant.
Still, I think the ability to run scripts through the MSVS debugger is enough of a reason to justify upgrading to Zorro S.