EC Square Sans Pro is not a default system font (like Arial or Helvetica). It’s a premium geometric sans-serif, often bundled with specific design software or purchased from foundries like Ecotype (or a custom corporate typeface).

Quick check:

If nothing appears, you don’t need an “update” – you need the original installation.

If you originally purchased a license that includes updates (most do from reputable foundries), yes – the UPD is free. If you are using a free trial or a pirated copy, the updater will fail. You must purchase a valid license.

The addition of "Pro" to a font name usually signifies that the font family has been expanded to support a wider range of languages and typographic features.

For EC Square Sans Pro, this typically includes: