You can select whether to open or save the file.
If you select 'Save' a ZIP file be saved on your computer. This ZIP - file can be saved on a removable disk (USB stick) and then you can install the addon on computers which do not have access to the internet.




Click on the file and then on 'Run'




Click on 'Yes' if you want to install the addon




On the following PopUps click on 'Next'








Click on 'Yes' if you want to download and install the addon




If the addon was installed completely you will see this PopUp