Is Remastered Orchestral Soundtrack free?

Yes. Remastered Orchestral Soundtrack is released under GPL-2.0 / Community Music and costs nothing. Neither it nor Privateer Gemini Gold has any paid content.

What do I need to run Remastered Orchestral Soundtrack?

Privateer Gemini Gold, which is itself free. Remastered Orchestral Soundtrack is an add-on and will not run standalone.

How do I install Remastered Orchestral Soundtrack?

The PlayBound Launcher installs it in one click from Privateer Gemini Gold's mods list. You can also install it by hand — full steps are on this page.