My server had to be rebuilt, but the installer fails

My server crashed, and I had to rebuild WordPress. However, when I went to install the theme, the installer said that “” didn’t have a valid installer. It said “The package could not be installed. No valid plugins were found.”
I don’t know what to do - do you? If so, please help me!

Hi, you are trying to install a wrong file (and also doing it in a wrong place in the admin). Please read this article: