Step 1 - All plugins required have been into your download package, so you only need to do is click on the "Begin installing plugins"
Step 2 - You should be navigated to the Install Required Plugin page, which shows reqquired plugins list, all you need is clicking on the checkbox beside "Plugin" label to select all plugins in the list, then choose "Install" from the drop-down list at the top and then click "Apply".
Step 3 - The installing process status will be shown in your browser. It may takes a few minutes, so please be patient. After sucessfull, your screen like that
When the notice "All installations have been completed" appears, click on the "Return to Required Plugins Installer" link to turn back to the plugin list.
Step 4 - Next, click on the box beside the Plugin label again to select all plugins and choose Activate this time as image below.