Microsoft Windows 8.1 is specially designed to provide a reliable environment for touchscreen devices. With the latest tile-based menu bar, it provides an eye-catching user interface. A new look and feel make this operating system even more attractive. There is a bundle of enhancements and new features that make it even more stable and reliable. With Windows Defender improvements, it provides better security features and protects against different internal and external threats.

Microsoft Windows 8.1 is specially designed to provide a reliable environment for touchscreen devices. With the latest tile-based menu bar, it provides an eye-catching user interface. A new look and feel make this operating system even more attractive. There is a bundle of enhancements and new features that make it even more stable and reliable. With Windows Defender improvements, it provides better security features and protects against different internal and external threats.

Everything is new. Everything on the shoulder.
macOS Big Sur takes Mac to new heights of performance and visual aesthetics. Enjoy a striking design that makes your Mac experience even easier. Pay tribute to the biggest Safari update ever. Try the new Maps and Messages features. And learn even more about ways to protect your personal data.
Mac magic.


In a new design.
Unrivaled power. Incredible usability. Unlimited creative possibilities. MacOS Big Sur makes all of this even more exciting.
Applications
without unnecessary details
Full-height sidebars, updated toolbars. In the new laconic design of applications, nothing distracts from the main thing - from the content.
Updated Dock
The sleek new design of the Dock makes accessing your favorite applications even more convenient. Application icons are stylistically consonant with the icons of other devices, but at the same time retain their individuality.
Mac Control Center
Instant access to the controls you use most (such as Wi-Fi and Bluetooth) and new controls for listening to music and turning on Dark Mode. Designed specifically for the Mac, Control Center lets you add new controls and drag and drop commonly used controls to the menu bar to customize it to your liking.
Notification Center
Notifications and widgets can now be viewed in one window. Notifications are grouped by application. Many notifications have become interactive and let you, for example, turn on a podcast or find out details about invitations in Calendar. The updated widgets are presented in three sizes, and you can choose the one that suits you.

Release date: 12/14/20
Version: 11.1 (20C69)
Developer: Apple Inc.
Developer site: https://www.apple.com/macos/big-sur/
Platform: Intel only
Interface language: Russian + English
Tablet: Not required
System requirements: macOS Big Sur supports the following models:
MacBook 8.1 or newer
MacBookAir 6.1 or newer
MacBookPro11.1 or newer
Macmini7.1 or newer
iMac14.4 or newer
iMacPro1,1
MacPro6.1 or newer
for hackintosh:
Only processors with SSE4,2 are supported
Video cards supporting Metal (Intel HD4000 and higher, nvidia kepler, AMD GCN-based).


Guide:

https://www.youtube.com/watch?v=nhAVUHWNNaw&feature=emb_title

Windows 10 is a series of personal computer operating systems produced by Microsoft as part of its Windows NT family of operating systems. It is the successor to Windows 8.1, and was released to manufacturing on July 15, 2015, and to retail on July 29, 2015. Windows 10 receives new releases on an ongoing basis, which are available at no additional cost to users. Devices in enterprise environments can receive these updates at a slower pace, or use long-term support milestones that only receive critical updates, such as security patches, over their ten-year lifespan of extended support.

Microsoft has released cumulative update for the latest Windows Server, version 20H2 SAC. KB4592438 (OS Build 19042.685) brings a number of updated highlights, improvements and security fixes.