Exclude page from search + not found message

Hello,

Thank you for this nice plugin, I hope this gets updated by the author.

Ok so I found a solution to search by id in the frontend using the link or here https://www.ads-software.com/support/topic/front-end-search-by-post_id/ it works but I need to exclude the page from being searched as well as an error message if a search is not found. hopefully someone can help me.

The page I need help with: [log in to see the link]