i can't find my marketplace

hi. i just changed my windows. know after starting UE4 , first i can’t see my projects, but i can browse them, second i can’t find my marketplace at the top of the UE4. is that because of my windows? do i must install launcher again?

Yes you have to install the launcher. It is because the engine has no idea where is the launcher on the windows filesystem.

i edited my question and added a photo.