Apple released watchOS 4.3.1 for the Apple Watch on Tuesday. The update is mostly bug fixes, and also adds a warning when users launch apps compiled for watchOS 1.
The warning indicates that watch apps compiled for watchOS 1 may not be compatible with future versions of watchOS. That’s a pretty clear indication that at some point Apple plans to drop support for apps compiled with the original watchOS SDK.
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To install watchOS 4.3.1 your Apple Watch needs to be on a WiFi network, in its charger, and have at least a 50% charge. Once you check off all those requirements, go to the Watch app on your iPhone, tap My Watch, go to General, and select Software Update.
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