AES 7.2 will install and run on Pega 7.3 but has not been tested or certified. I have noticed that Pega 7.3 adds an extra 'header' at top of the portal which looks odd but has no functional impact. Presumably one would need to take the hotfix that was needed for Custom Reports to work on Pega 7.2.2. AES 7.3 for Pega 7.3 will soon be available.