This project requires the TweenMaker plugin, which can be found here
The TweenMaker plugin allows a user to easily create animations at runtime, both in Blueprints and C++.
A packaged version of this project (built in version 4.19) can be found here (it DOES NOT require the plugin in order to be used).
The plugin's documentation can be found here.
The C++ documentation can be found here.