Upload the zip file to your webserver, and copy the contents of the “upload” folder to your web root.
adminCP > Extensions > Import products
I did almost nothing here. The credit goes to https://github.com/Seldaek/monolog
More details here later if and as required. Developers can follow along no problem, and webmasters will want to wait until there is a good reason for doing this.
Our good reason is stewfix, which will use Monolog for logging.