As mentioned earlier, remove the jqzoom block from you website by using the Add Functionality section in your dashboard.

Move the directory blocks/jqzoom to packages/c5book/blocks.

Open the package controller we created a few pages earlier; you can find it at packages/c5book/controller.php. The following snippet shows only a part of the controller, the install method. The only thing you have to do is insert the highlighted line:

public function install() {
   $pkg = parent::install();

   // install blocks
      BlockType::installBlockTypeFromPackage('jqzoom', $pkg);
}

Save the file and go to your dashboard again. Select Add Functionality and locate the c5book package; click on Edit and then Uninstall Package and confirm the process on the next screen. Back on the Add Functionality screen, reinstall the package again, which will automatically install the block.