Why Apple Watch 8.5 Software is not updating?

Hello and welcome to Apple Support Communities, djeya49!

We understand you're having trouble updating your Apple Watch. We'd be happy to provide information to help you out.

Try the steps suggested here: Update your Apple Watch"If you need help updatingTry these steps:Make sure that your Apple Watch connects to its charger. Restart your Apple Watch. Press and hold the side button until you see Power Off, then drag the slider. To turn your watch on again, press and hold the side button.Restart your paired iPhone.Try to start the update again. If the update won't start, open the Watch app on your iPhone, tap General > Usage > Software Update, then delete the update file. After you delete the file, try to download and install watchOS again.Learn what to do if you see 'Cannot Install Update' when updating Apple Watch."

Have a great day!

That's great, djeya49,

You're most welcome.

Take care and enjoy your weekend!