2.1 How to get R.app. R.APP is part of the binary distribution of R for Mac OS X available from CRAN.That distribution consists of one package containing the R framework and R.APP. Development versions of R.APP are made available on daily basis in the form of a disk image containing the R.APP itself. See the Mac OS X pages on CRAN for detail how to obtain such snapshots (currently at http.

Check compatibility

Web browser plugin for Mac OS X Support for NPAPI plugins was removed from all modern web browsers, so VLC's plugin is no longer maintained. The last version is 3.0.4 and can be found here. It will not receive any further updates.
GNU Emacs For Mac OS X Pure builds of Emacs for Mac OS X. Download Emacs Version 27.1-1 Universal Binary (62.351 MB) Released 2020-08-11 Usually there's a nifty page here with a big download button. But you are using a browser which doesn't support SVG and so you get the boring looking page.

You can upgrade to OS Yosemite on any of the following Mac models. Your Mac also needs at least 2GB of memory and 8GB of available storage space.

MacBook introduced in 2009 or later, plus MacBook (13-inch, Aluminum, Late 2008)
MacBook Air introduced in late 2008 or later
MacBook Pro introduced in mid 2007 or later
Mac mini introduced in early 2009 or later
iMac introduced in mid 2007 or later
Mac Pro introduced in early 2008 or later
Xserve models introduced in early 2009

To find your Mac model, memory, storage space, and macOS version, choose About This Mac from the Apple menu . If your Mac isn't compatible with OS X Yosemite, the installer will let you know.

Make a backup

Before installing any upgrade, it’s a good idea to back up your Mac. Time Machine makes it simple, and other backup methods are also available. Learn how to back up your Mac.

Get connected

It takes time to download and install OS X, so make sure that you have a reliable Internet connection. If you're using a Mac notebook computer, plug it into AC power.

Download OS X Yosemite

For the strongest security and latest features, find out whether you can upgrade to macOS Catalina, the latest version of macOS.

If you still need OS X Yosemite, use this link: Download OS X Yosemite. A file named InstallMacOSX.dmg will download to your Mac.

Install the macOS installer

Double-click the downloaded file to open a window showing its contents. Then double-click the file within, named InstallMacOSX.pkg.

Follow the onscreen instructions, which will guide you through the steps necessary to install.

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Begin installation

After installation of the installer is complete, open the Applications folder on your Mac, then double-click the file named Install OS X Yosemite.

Click Continue and follow the onscreen instructions. You might find it easiest to begin installation in the evening so that it can complete overnight, if needed.

Allow installation to complete

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Please allow installation to complete without putting your Mac to sleep or closing its lid. Your Mac might restart, show a progress bar, or show a blank screen several times as it installs both OS X and related updates to your Mac firmware.

Learn more

OS X Yosemite won't install on top of a later version of macOS, but you can erase your disk first or install on another disk.
You can use macOS Recovery to reinstall macOS.

In this step-by-step guide, learn how to enable Adobe Flash Player in the Safari web browser.

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Before you start, check the version of Safari running on your Mac. To display the version number, choose Safari > About Safari.

If your Safari version is 11.0 or later, follow the steps in For Mac OS X 10.11, macOS 10.12, and later.
If your Safari version is 10.0 or later, follow the steps in For Mac OS X 10.10.

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Note:

Apple Safari version 14, released for macOS in September 2020, will no longer load Adobe Flash Player or play Flash content. Please visit Apple’s Safari support for more information.

Click the Websites tab and scroll down to the Plug-ins section. Locate the Adobe Flash Player entry.

Select a setting to use for Flash Player when you visit other websites.

You can configure Flash for individual websites (domains). Select a website listed in this window, and choose Ask, Off, or On.

Exit Preferences after you finish configuring Flash Player.

Note:

If you are viewing Safari in full-screen mode, mouse over the top of the browser screen to see the menu.

Click the Security tab. Ensure that Enable JavaScript and Allow Plug-ins are selected. Click Plug-in Settings.

From the When visiting other websites menu, choose On, and then click Done.