Adding Acrobat to Microsoft Outlook

I'm running Microsoft Outlook on Windows 10.  I need to convert a long email chain to pdf.  For that purpose, I have bought Acrobat, having read that it can be added in to Outlook.  Unfortunately, despite following the instructions on the Adobe website, I am unable to do so. I am told that Outlook should recognise the Acrobat app, but it doesn't.

Has anyone else experienced the problem, and how can I fix it, please?

All help will be hugely appreciated, since I am running out of time.