There are multiple versions of Revathi floating around (Revathi, ML-Revathi-KDE, Revathi-TT). For PageMaker, you need the specific version.
If you installed the font but can't find it in PageMaker:
font, you are likely dealing with legacy systems or specific aesthetic requirements that modern Unicode fonts don't always replicate. Here is a guide to getting ML-Revathi up and running in PageMaker. 1. Why ML-Revathi?
This article explores the technical context, legacy, and modern-day challenges of using the ML Revathi font within PageMaker.