It is probably a good idea to download from this link http://www.decodephp.com 
as the wordpress plugins download sections seems to miss the tempfiles directory or the file in it for some reason , 
this directory is very important for the plugin to work.
This plugin will help you quickly switch between wordpress admins by letting you select from a list of blogs you have entered in the 
WP Admin Switcher administration section. Assuming you are on the posts management page , and you select a different blog from the drop down you will be immediately switched to that blogs posts management page. The plugin attempts to keep all functionality intact. When you are on the other blogs page , you continue to see the drop down , you can select “Parent Site” from the list to jump back to the parent blog.
The plugin will also work with free blogs hosted at wordpress.com.

WP Admin Switcher

It is probably a good idea to download from this link http://www.decodephp.com

WPZOOM

Pavel Ciorici

Custom Posts Per Page Reloaded allows you to specify how many posts are displayed per page depending on your current view. Once settings are changed, the Blog pages show at most setting in the Reading menu will be ignored.
Settings are available for:
<ul>
<li>Home (Index) Page
<ul>
<li>As long as view is set to blog posts, not static page.</li>
</ul>
</li>
<li>Category Pages</li>
<li>Tag Pages</li>
<li>Author Pages</li>
<li>Archive Pages</li>
<li>Search Pages</li>
<li>Default Page (Any page not covered above.)</li>
<li>Custom Post Type archive pages
<ul>
<li>All Custom Post Types are detected automatically.</li>
</ul>
</li>
</ul>
Each of the above settings can have a different value for the first page displayed and subsequent paged views.
Custom Posts Per Page makes it easy to manage exactly how your content is displayed to your readers, especially when different views have different layouts, rather than relying on the single setting in the Reading menu or having to hard code options in your custom theme.
This is a fork (an updated clone) of <a href="https://wordpress.org/plugins/custom-posts-per-page/" rel="ugc">Custom Posts Per Page</a> by <a href="https://jeremyfelt.com/" rel="nofollow ugc">Jeremy Felt</a>.

Custom Posts Per Page Reloaded

Custom Posts Per Page Reloaded provides a settings page in your WordPress admin that allows you to specify how many posts are displayed for different  …

WP Admin Switcher vs Custom Posts Per Page Reloaded