title: Cannot Install Wordpress Plugin (Download failed)
body: <p>i am using WordPress 3.6.1 and I have strange problem today. First I have to tell that my current website was copied from old website, both the WP files and database.</p>
  
  <p>So in the current website, I try to install new plugin, but it returns error:</p>
  
  <p>Downloading install package from <a href="http://downloads.wordpress.org/plugin/xml-sitemap-xml-sitemapcouk.zip" rel="nofollow">http://downloads.wordpress.org/plugin/xml-sitemap-xml-sitemapcouk.zip</a>…</p>
  
  <p>Download failed. Could not open handle for fopen() to /home/k5841724/public_html/wp-content/uploads/xml-sitemap-xml-sitemapcouk.tmp</p>
  
  <p>Then all my plugins are dissapered (Akismet, Hello Dolly, etc), and I can't install any plugin. Nothing wrong with my permission, /wp-content, /wp-includes, /wpcontent/uploads all are set to 755. Any idea what is the solution for this issue? Thanks.</p>
  
  <p><strong>addition note:</strong>
  all my plugins folder (Akismet, etc) still there inside wp-content/plugins folder, but not appear in WP Dashboard.</p>