problem with WordPress

I can not customize any theme in wordpress, I can not download plugins, I can not install the themes. I always get the error of ^ could not unzip the file ^ or ^ the file could not be unzipped ^. I can not practically edit my web.
my two pages are the same
page 1 ----)
page 2 ----)

errors on my page
1 picture= error downloading plugin
2 picture= error installing WordPress theme
3 picture = error when customizing my web

4 picture =error installing theme from my pc to WordPress

Have you tried installing the plugins and themes manually (i.e. downloading them to your own computer, extract them and then upload them through FTP)?

if the template if you can by FTP but when you customize it you can not save

Thank you, we have solved the problem