Updating microsoft excel models

I want to know how to update excel models to latest versions. My model file works in only excel 2003 and when i open the excel file in other versions and enable macros a pop message reads " PROJECTION MODEL - SYSTEM CHECK, THIS MODEL REQUIRES EXCEL 2003.

You need to change the vba code in the macros. Whoverever built that model has put an excel version check in. Without seeing what it does or why, no-one can tell you how to update it