Your installer for Adobe reader (the free version) has a certificate that is no longer valid. When you start the installer and click "Show information about the publisher's certificate" it reads: Valid from 19/22/2020 to 22/12/2022.
Last time I checked it was 2023.
Downloaded from the official website: https://www.adobe.com/acrobat/pdf-reader.html
No need to reply, I already got the answer here: https://community.adobe.com/t5/acrobat-reader-discussions/the-installer-for-adobe-reader-has-a-certi...
(btw I did have a typo in the dates: 19/12/2020 to 22/12/2022)