How to install Accelerated Mobile Pages (AMP) without composer
Since the AMP module requires the Lullabot AMP Library, there really is not a great way to install this without Composer. That is because Composer will update the autoloader information with that namespace and vendor information and fetch dependencies. Downloading the tarball of the module and the GitHub download unfortunately will not do the trick - you must use Composer. The module will block installation if it cannot find the class namespace of \Lullabot\Amp.

The Lullabot AMP Library also has its own dependencies listed in its composer.json, so Composer is required here.