Customer account + personalizationsection in the Plugin Manager, or by searching for "nosto". If you can't find it, you can also manually download it from the Community Store.
Download nowbutton on the plugin page and follow the instructions to activate the plugin.
SHOPWARE/engine/Shopware/Plugins/Local/Frontend/folder inside Shopware. The plugin archive file can be obtained from the projects releases page on GitHub.
NostoTagging-x.x.x.zip, and NOT the "source code". The release package contains the needed dependencies which the source does not.
/engine/Shopware/Plugins/Local/Frontend/NostoTaggingdirectory of the Shopware installation. For the plugin to work, it's dependencies need to be installed. For this we recommend using composer, which is a dependency manager for PHP. By executing composer install in the plugins root folder, the dependencies will be automatically fetched and installed in a vendor folder relative to the plugin root directory.