Click on the ArchBlocks Titleblocks ribbon button under Add-ins tab or these libraries come as standard.DWG file with Title block references in them. You can access this content via Design Center Palette in the below location 
%AppData%\Autodesk\ApplicationPlugins\ArchBlocks Title Blocks.bundle\Contents\windows

Included in this Paperspace Titleblocks library are the following: Sheet sizes A 8.5x11, both landscape and portrait, B 11x17, C 12x18, D 24x36, E 30x42.

Basic layer list. Dimension styles. Border and titleblocks. Modelspace viewport.

The installer that ran when you downloaded this app/plug-in from Autodesk App Store will start installing the app/plug-in. OR, simply double-click the downloaded installer to install the app/plugin.

You may need to restart the Autodesk product to activate the app/plug-in.

To uninstall this plug-in, exit the Autodesk product if you are currently running it, simply rerun the installer, and select the "Uninstall" button. OR, click Control Panel > Programs > Programs and Features (Windows 7/8/8.1/10) and uninstall as you would any other application from your system.

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