You will need the correct Unity version to run the project. There are two ways you can acquire it:
Check what our current Unity version is, then find that specific version in the Unity download archives below.
Download Unity Hub, then open our project using the hub and it should auto-detect our Unity version and prompt a download for that version.
To avoid having to update the current version in this document every time it's updated, we will just point you to the version file instead.