I'm just starting the "Appian Developer Project: Build an IT Application" and it mentions looking at the "ACME IT Manegement (AIM)" and "ACME IT Solutions (AIS)" applications, but neither is installed in my community edition server.
Is there some place where I could download their zip files to install them?
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No you cannot import/export a package in CE site.
Which CE site version you are currently using?
I can see both these apps in my Appian Designer on version 23.1