The project you are opening uses the following addons that are not installed. Try installing these missing plugins, behaviors and effects and then re-open the project.
Behavior LiteTween (lunarray_LiteTween) by lunarray
it still doesn't work, even though I have installed what is needed
Can you help me? might give the correct "Behavior LiteTween (lunarray_LiteTween) by lunarray", via the download link