TomiI’m sorry for the late answer; a longer journey …
Yes, it’s enough to unzip it to the root folder of the wp-rocket plugin.
That archive contains what the composer would place in that location.
I saw that link was deleted; for those who are in a hurry, now I created an Bitbucket snippet that contains that archive but I do not know how long the link will be tolerated here.
For those who do not trust or are curious, I explain how I can make it more concise.
If you can run composer on the server where wordpress is installed, just run ‘composer install –no-dev’ from the root folder of the plugin.
Otherwise, on another computer, even Windows, install composer, create a temporary folder where you copy the composer.json file found in the plugin, and then launch the same ‘composer install –no-dev’ command from that folder.
It will be enough to copy ALL the content of the vendor folder that will be created in the temporary folder to the plug-in root folder.