Most VBA code written in older versions of Excel will work just fine on newer versions of Excel. Only a few things have been deprecated over the years (i.e. like some file browsing options).
So most of the time, you shouldn't have to do anything special to run them, unless maybe you used some special coding libraries.
If you did use special coding libraries, those errors can usually be fixed pretty easily by simply selecting the most recent version of that coding library under "References" in the VB Editor.
Have you tried running the code in your current version to see if it works, or has any errors?