How to manually install the grafana-clock plugin

I think, I got the plugin folder

in the conf file it says that the plugin folder is:

...../data/plugins/

cat /....../grafana/grafana/grafana-5.4.3/conf/defaults.ini | grep -i plugin
# Directory where grafana will automatically scan and look for plugins
plugins = data/plugins
# for new versions (grafana itself and plugins), check is used
# in some UI views to notify that grafana or plugin update exists

So the plugin has to be unzipped to this folder ..../data/plugins/ , so the next issue is this:

please help
Thanks