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The Watch App will need to be reinstalled if you had the previous version on your Apple Watch. Since the new App is now native to the Watch and no longer requires the iPhone for most of it's functionality, it's essentially a new App. Please uninstall and reinstall the App on your watch and remember to give it enough time to complete this process as it is a bit sluggish ;-) The App will not start properly until the installation has finalized on both ends (the Watch and the Phone).
Note: please remember to Cleanup if you've purchased one of the standalone apps: CALC Premium or CALC Swift - make sure you have only one version of CALC on your Watch and your iPhone.