How can I install CKEditor on a server without downloading the files locally? A bit of background info before I get down to my question - I'm using the URL method of loading modules to Drupal as I do not wish to save them to my dinosaur age PC. I have also not uploaded Drupal to my PC, but am operating it via Pantheon. This is not only because of my old PC, but as I am only in the very early stages of developing my website, one advisor has said I don't need to worry about that and other programs such as MySQL.

I'm keen to get CKEditor onto my Drupal platform, so have added the CKEditor - WYSIWYG HTML editor module and this appears so far to be successful.

The tutorial I am following assumes that I am able to save the CKEditor program to my PC... which I guess in essence I can, but I am hoping there is a way to avoid doing this and load it the same way I do a module via URL perhaps?
Pantheon assumes that you are using git; although there is an on-server development feature, the primary workflow is designed to use git as a conduit between your local machine and Pantheon's servers.

Nearly all tutorials you encounter will also assume you are able to download files to your server/local machine.

Even if you don't install Drupal to your local machine, you can clone your Pantheon repository and download/edit/commit the files locally without running Apache, MySQL, etc.  (Documentation here)

I would not try loading modules via URL using Pantheon; you need to learn how to use Git or you will constantly be running into problems later when you try to sync your sites.

Alternately, if you just want a WSYIWYG editor and some other nice features, you could try spinning up the Panoply distribution of Drupal 7, which includes a bunch of modules pre-configured out of the box (though it still has a fair number of bugs).