Computer says "the dns server isnt responding"

This is after trying simple dnscypt for a day then i shutdown the computer without turning off the app itself. I guess the app did something to the services/registries and now i cant connect to the internet without fixing the modifications.

Edit: is it true that the app is an abandonware?
How do i undo the modifications? thanks in advance
I trier to ping websites like google and it works.
Edit 2: pc now works after fresh install.