Simply use the usual Tool Replace mechanism to put in the most recent beta updates. Complete installers may also be downloaded thru Apple’s Dev Center.
The construct numbers are as follows:
● iOS 10.3.3 - 14G5047a
● macOS Sierra 10.12.6 - 16G16b
● watchOS 3.2.3 - 14V5744a
● tvOS 10.2.2 - 14W5745a