Login in Moodle with site wide administrative rights
Click on Site Administration
Select the Plugins tab
Click on Install Plugins
Under the “Install plugin from ZIP file” click on Choose file and from the File Piker window click on Choose file.
In the window titled “Open” navigate to the folder where the zipped file is located (that is the zipped file you downloaded in step 1) and click on Open
Finally, click on install plugin from the zipped file and follow the steps.