Down load files are not loading correctly

I have down loaded the files to install loads of time and have removed them and started again and had are tech dept to help. But i am getting this message when on the addins section so not sure what to do next. This is really urgent and could do with speaking to someone please

Hi @lmstott ,

Thank you for getting in touch.

The below article should help you resolve this issue given that there are no security protocols implemented by your IT people that affect the add-in.

If this does not work then I can suggest your IT people to look into the article below.

Kind regards,