Installing Adobe Acrobat Reader DC is a two-step process. First you download the installation package, and then you install Acrobat Reader DC from that package file. Mac os software, free download - Apple iOS 13, R for Mac OS X, Apple Mac OS X Mavericks, and many more programs.
This is a user-to-user forum. Apple leadership (decision makers) do not monitor these forums, so no one here can answer the '...anytime soon' question.
Mavericks and Yosemite are ONLY available for re-download if and only if you have previously downloaded them, in which case they should be in your Applications -> App Store -> Purchases tab when signed into the Apple ID you originally used to download them. Otherwise, the App Store will not offer them to you.
Q Emulator allows you to virtualize different Operating Systems on Mac. It supports from Windows 95 to Windows Vista, as well as MS-DOS and LiveCD. Other interesting feature of Q Emulator is the possibility to download new Operating Systems, such as FreeDOS, ReactOS or Ubuntu. Download Mac OS X 64-bit/32-bit installer; Python 3.4.4rc1 - Dec. Download Mac OS X 32-bit i386/PPC installer; Download Mac OS X 64-bit/32-bit installer; Python 3.5.1rc1 - Nov. Download Mac OS X 32-bit i386/PPC installer; Download Mac OS X 64-bit/32-bit installer; Python 2.7.11rc1 - Nov. Download Mac OS X 32-bit. The latest version of OS X features an elegant design, includes enhancements to the apps you use most, and enables your Mac and iOS devices to work together in new ways. Learn more about OS X; Safari extensions are a great way for you to add new features to Safari. Built by developers, Safari extensions use the latest web technologies.
Some users have been able to make Genius Bar appointments at their local Apple store, and get them to install older versions of macOS
Paid developers have access to older versions of macOS for product testing, if you want to go that route.
Depending on what version of macOS you are currently running _AND_ your hardware configuration, it may be possible to download El Capitan for free (see this URL):
<https://support.apple.com/en-us/HT206886>
Q Download For Mac Os High Sierra
Q Download For Mac Os 10.10
And of course, High Sierra is available for free, if your system supports it.