Where is the official download?
The official main domain is sogouinputmethod.com: Windows at sogouinputmethod.com/windows, Mac at sogouinputmethod.com/mac, mobile at sogouinputmethod.com, and on iOS search the App Store for Sogou Input.
How do I spot a fake download site?
Trust only sogouinputmethod.com. Domains like app-sogou.cn, web-sogou.com or sogousoft.com that carry the Sogou name and a high-speed downloader button are copycats and may bundle adware or malware.

Installing on Windows without bundles
After downloading the official installer, choose Custom Install and uncheck the default extras such as the assistant, PDF and photo viewer, so only the input method itself is installed.
Does it support Windows 11?
Yes. The Windows build officially supports Windows 7, 8, 10 and 11 in both 32-bit and 64-bit. Get the installer from sogouinputmethod.com/windows and use custom install.
Downloading and enabling the Mac version
Get the Mac build at sogouinputmethod.com/mac, then add Sogou Pinyin under System Settings, Keyboard, Input Sources and grant the permissions it asks for.
Android APK and Google Play
On Android, prefer the official APK from sogouinputmethod.com or a mainland app store. Google Play availability varies by region; if you cannot find it, use the official APK rather than a trimmed third-party build.
iOS install and permissions
Install from the App Store, then go to Settings, General, Keyboard, Add New Keyboard and add Sogou. Turn on Allow Full Access so voice and cloud features work.

US or overseas Apple ID cannot find it
Overseas App Stores often do not list Sogou. Switch your Apple ID to the mainland China or Hong Kong region to search and download it; on Android just use the official APK.
Download page will not open or is slow
The official page is dynamically rendered and loads slowly on overseas IPs, sometimes appearing blank. Refresh, change network or time of day, or simply use the App Store on iOS.
Installer size and version number
Package size and version vary; always check the current figures on the official site. Download the latest build each time, since older installers may carry already-fixed issues.
Do I need a separate traditional build?
No. The Pinyin version has built-in simplified-traditional switching: press Ctrl+Shift+F or change the output setting. Taiwan has a Zhuyin branch, but its old build is unmaintained, so prefer the Pinyin version.
Cleaning leftover files after uninstall
Uninstall from the system Apps list, then check the install and user-config folders for leftover directories to remove manually. Back up your personal dictionary before reinstalling the latest build.
Sources: Sogou Input official site、Sogou Pinyin、Apple App Store、Microsoft Support 据上述官方与权威资料整理。