Use some sort of onload function to check whether template version uses the latest template.

[zzzjoshzzz]

For example, the document knows it is version 3.1 (because, for example, that number is written in a textbox somewhere) and then the document macro goes and checks a different file that has the latest version number. Then, the macro communicates to the user (by a message box? or in the header of the document?) whether or not that version is the latest version (For example ("this document is using version X, the latest version is version Y")
X and Y could be numbers or dates or both.

I'd really love some help on this, I haven't coded in a while (but I do have experience coding in vba in the past)