Website says that I have an old version of the addon

HI i cant sim my stuff or look for an upgrade cuase it keeps telling me i dont have the right version downloaded but i do have version 15 for wotlk? i could sim and use it yesterday perfectly fine but today all of a sudden i get this mssg

this is the version i have

In your top screenshot, you are on the Dragonflight version of the website. Click the WotLK link at the top-right of the page to go to the WotLK optimizer page.