If you are using Finale (version 25 or 25.1, the latest version) the movie window has been removed in favor of Rewire capability It is gone and almost certainly gone permanently.

2014 is still supported. You might want to call MM Support on this.

Update: 2014/2.14.5 on the Mac is no longer supported in OS 10.13 High Sierra as far as I know.

My own testing shows that, if already installed and the OS is upgraded to 10.13, it works the same as in Sierra (some functionality is limited). I am guessing that a fresh install is no longer possible but I've not tested this for myself.

Movie Window has been removed? you have to be a giant Idiot to remove such a great tool. so I payed for an update that doesn't have the tools that I use the most. Good way to send your customers to sibelius, really? I cant believe they did that who is the idiot who did that?

We are users and don't work for MM.

MM recommends using Rewire.

What is ReWired? How do I use it? I just need to compose music for a Video.

Who is MM?

MM (MakeMusic) is the company that makes Finale.

Rewire is a feature new to Finale 25 that makes it possible to link Finale in certain (so far, limited) ways to a DAW.

https://www.finalemusic.com/blog/connect-others-using-rewire-new-finale/ 

Another blog entry (well in advance of the release of Finale 25) makes clear that the Movie Window (subject of numerous complaints in the past) would not be included in version 25.

https://www.finalemusic.com/blog/streamlining-the-next-version-of-finale/ 

Calling people idiots is not productive.

I'm in the same boat, David Cabera. W/o the movie window, Finale is virtually useless for a film composer. The "Rewire" crap is convoluted and doesn't actually work. MM (MakeMusic) *used to* advertise itself as the notation app for Hollywood, and it was. But with the movie window gone, all future updates are doorstops in this town (Hollywood). It is the single stupidest thing a company ever did since the Tramels ran Atari into the ground. So it's "stay on 2014.5" until it dies and then buy Sibelius which I hate). I've been featured at least twice as a Finale artist and each time it was because i was scoring a film with Finale. Once for the Olympics and once for the Chicago Symphony. I am as much a fanboy as anyone, but if I can't score to picture, the app is useless.

Truly, the dumbest decision ever.

Working without the movie window is beyond unproductive. It's a work stopper. I have to agree. Whoever is responsible for removing the feature is not just an idiot, they are a stupid idiot. I have additional adjectives that may be inserted between those two words. If you block my ability to work, there is no word harsh enough to describe you.

Mac or Windows? What OS version? It all makes a difference

Window and my most recent version before 25 is 2010

Sorry, what is the OS version?

What version of Windows are you using? Windows 7? Windows 8? Windows 10 Pro - Version 1903? That is what "OS version" (Operating System version) means.