Most devices provide Netflix as a pre-installed app that you can access from the main menu, or from a Netflix button on your remote. If you are unable to locate Netflix from the main menu or remote, it's possible that your device has an app store you can download the Netflix app from. If you cannot locate the app store or don't see Netflix.

Method 1: How to Open Netflix APP on Mac? You Can Just Watch Netflix in a Web Browser

Pay attention that not every browser can open Netflix for Mac.

First, if your 2019 Macbook Pro/Air is running Mac OS X El Captain or Yosemite, Netflix movie streaming is directly available in its native browser - Safari (latest version) - with the built-in settings for html5 video.
Second, should you be running Mountain Lion or earlier, follow the official instructions from netflix.com which describes how you can install a plug-in called Silverlight in order to watch, which we provide below:

Step 1: Vist www.netflix.com on your Mac computer, choose the New Year movies on Netflix you want to play.
Step 2: When a Silverlight dialog windows opens, hit 'Install Now', which takes you to install Silverlight.dmg, kindly notice that download location is different depending on your web browser.
Step 3: Right-click or hold Control on your Mac's keyboard and select Silverlight.pkg, then select 'Open' on the popping-up menu.
Step 5: Upon the warning 'Silverlight.pkg is not from the Mac App Store. Are you sure you want to open it? Opening Silverlight.pkg will always allow it to run on this Mac.', proceed with a 'Yes'.
Step 6: Follow the installation wizard to successfully install Silverlight for Netflix Mac APP.

Notes: Should the Netflix plug-in Silverlight for Mac fails to download, you may also access it through Microsoft Silverlight website at https://www.microsoft.com/getsilverlight/Get-Started/Install/Default.aspx.
Pros: No extra cost.
Cons: Safari on Mac streams most of Netflix movies just fine. But if Netflix 4K Movies or Netflix 3D movies is also your cup of tea, then think twice. Just like Amazon Prime Video, they doesn't make 4K content available on Netflix for Mac (or PC).
But is there still a way to watch Netflix 4K on Mac without hiccups? You can go by the No.2 method - a free alternative to Netflix for Mac.

Method 2: Free Alternative to Netflix APP for Mac

How To Download Netflix App On Macbook Air

This is not exaggerating, but 5KPlayer for Mac - a free video player and downloader - supports not only Netflix 4K content, it also configures H.265 codec to render 4K streaming smoothly. It's a second-to-non choice if you need a Mac-based Netflix client that combines movie download and playback 2-in-1.