Using the IDE built-in plugin system:
Settings/Preferences > Plugins > Marketplace > Search for "QuickProjectWizard" > Install
Using JetBrains Marketplace:
Go to JetBrains Marketplace and install it by clicking the Install to ... button in case your IDE is running.
You can also download the latest release from JetBrains Marketplace and install it manually using Settings/Preferences > Plugins > ⚙️ > Install plugin from disk...
Manually:
Download the latest release and install it manually using Settings/Preferences > Plugins > ⚙️ > Install plugin from disk...
Plugin based on the IntelliJ Platform Plugin Template.