16pt isn't a supported option for the basic article class. You need to
use a class which supports such and option.
Take a look at:
https://www.ctan.org/tex-archive/macros/latex/contrib/extsizes?lang=en
These classes don't support 16pt, but they do support 17pt. If you have
a complete MiKTeX installation, they should already be installed, but if
they aren't you should be able to get them through the MiKTeX package
manager.
There's also the other methods I mentioned.
Also note, this isn't really a Gregorio question, but rather a basic
TeX/LaTeX question. While I'm happy to answer such questions as I know
how, you'll probably get better results searching online for a TeX/LaTeX
tutorial on how to do what you want to do or asking on
http://tex.stackexchange.com. You'll find far more (and far more
competent) resources that way.
✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝
Br. Samuel, OSB
St. Anselm’s Abbey
Washington, DC
(R. Padraic Springuel)
PAX ☧ ΧΡΙΣΤΟΣ
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