Before you create a new scene or import the asset's functionality into your existing one, I recommend taking a look at the demo maps that come with the asset.
Demo maps path: "PolymindGames / SurvivalTemplatePro / _Demo / Scenes".
If you're having problems with installing STP, this guide can help you.
Considering STP is a template, make sure you're creating a new project for it instead of merging it with another project.
Make sure you're using Unity 2020.3 or newer.
Currently the only supported Rendering Pipeline is Built-In.
Make sure your storage at least 10gb left.
Navigate to: "Edit / Project Settings / Player / Configuration" and set the Input Handling to New or Both.
Changing the Input Handling System requires an editor restart.
2. Navigate to: "Window / Package Manager / My Assets" and find STP: Survival Template PRO.
3. After downloading the asset make sure to import the necessary project settings.
STP only requires a few project settings to function such as: custom Layers and Collision Matrix.
That is all, STP should function perfectly fine now. In case you encountered any problems with the installation feel free to ask for support.