Since you've purchased Office from the Microsoft Store app on your Windows device, you can update Office from the same place!
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Exit all Office apps.
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Open the Microsoft Store app by typing "Microsoft Store" into the taskbar search and press Enter.
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Select your profile icon in the top right corner and make sure you're signed into the Microsoft account associated with your Office license.
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Select the overflow icon (three dots to the left of your user icon) and choose Downloads and Updates.
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Select Get Updates.
Note: If you get a "You're good to go" message after selecting Get Updates, you don't have any new updates to install.