We don't host or link to older versions of Programming Editor. Trying to find a three year old version could be hard and may not even run under more recent versions of Windows. Do you even know what PE version you were using three years ago ?
PE updates are usually to add enhancements to the programming language, support new PICAXE or improve other aspects of the PE. It's very rare that an update is to fix a code generation error so, for the same program, same PICAXE, the code downloaded into the chip now would almost certainly be exactly the same as the code downloaded three years ago. That said; the compilers have changed over three years so it cannot be ruled out.
I would approach it as having a program which doesn't work, needing to discover why, as if you'd just written the code. If you had an old version, could demonstrate "that works, this doesn't" it could help but the problem you have can still be resolved without that.