Profile: berendvanderpoldfd

Good day,
Our customer brought to our attention that products that are no longer available for purchase are still appearing on the website.
We checked the Collections plugin and noticed that the products that are part of a range are still appearing on the website.
These are in stock: https://www.screencast.com/t/qXVDF1pXqXT
The items in the red blocks are no longer in stock but still appearing: https://www.screencast.com/t/iMzKYevZBHrp
Here are those products in the Collection plugin: https://www.screencast.com/t/gUcSBzLM

Is there a  way that when these products are no longer available for purchase that they can be removed from the range and no longer appear on the site?

Our customer has informed us that he is unable to access the Import Manager plugin. Please see screen here when I try and access: https://www.screencast.com/t/JAF0viJq25E

Here is a screenshot of the error on the server: https://www.screencast.com/t/JFSs3sBj

Here are screenshots of the logs:

https://www.screencast.com/t/tgp53x5R

https://www.screencast.com/t/zIIG9RH1

https://www.screencast.com/t/7CvvQ15N